CINXE.COM

<!DOCTYPE html> <html class="client-nojs vector-feature-language-in-header-enabled vector-feature-language-in-main-page-header-disabled vector-feature-sticky-header-disabled vector-feature-page-tools-pinned-disabled vector-feature-toc-pinned-clientpref-1 vector-feature-main-menu-pinned-disabled vector-feature-limited-width-clientpref-1 vector-feature-limited-width-content-enabled vector-feature-custom-font-size-clientpref-1 vector-feature-appearance-pinned-clientpref-1 vector-feature-night-mode-enabled skin-theme-clientpref-day vector-toc-available" lang="en" dir="ltr"> <head> <meta charset="UTF-8"> <title>Relative risk - Wikipedia</title> <script>(function(){var className="client-js vector-feature-language-in-header-enabled vector-feature-language-in-main-page-header-disabled vector-feature-sticky-header-disabled vector-feature-page-tools-pinned-disabled vector-feature-toc-pinned-clientpref-1 vector-feature-main-menu-pinned-disabled vector-feature-limited-width-clientpref-1 vector-feature-limited-width-content-enabled vector-feature-custom-font-size-clientpref-1 vector-feature-appearance-pinned-clientpref-1 vector-feature-night-mode-enabled skin-theme-clientpref-day vector-toc-available";var cookie=document.cookie.match(/(?:^|; )enwikimwclientpreferences=([^;]+)/);if(cookie){cookie[1].split('%2C').forEach(function(pref){className=className.replace(new RegExp('(^| )'+pref.replace(/-clientpref-\w+$|[^\w-]+/g,'')+'-clientpref-\\w+( |$)'),'$1'+pref+'$2');});}document.documentElement.className=className;}());RLCONF={"wgBreakFrames":false,"wgSeparatorTransformTable":["",""],"wgDigitTransformTable":["",""],"wgDefaultDateFormat":"dmy", "wgMonthNames":["","January","February","March","April","May","June","July","August","September","October","November","December"],"wgRequestId":"561c72aa-73aa-40a4-ae08-b97de8be1ca5","wgCanonicalNamespace":"","wgCanonicalSpecialPageName":false,"wgNamespaceNumber":0,"wgPageName":"Relative_risk","wgTitle":"Relative risk","wgCurRevisionId":1249344067,"wgRevisionId":1249344067,"wgArticleId":2622159,"wgIsArticle":true,"wgIsRedirect":false,"wgAction":"view","wgUserName":null,"wgUserGroups":["*"],"wgCategories":["CS1 maint: location missing publisher","CS1 maint: multiple names: authors list","CS1 maint: numeric names: authors list","CS1 errors: periodical ignored","Articles with short description","Short description is different from Wikidata","All articles with unsourced statements","Articles with unsourced statements from May 2023","Articles with unsourced statements from August 2023","Commons category link is on Wikidata","Epidemiology","Biostatistics","Medical statistics", "Statistical ratios"],"wgPageViewLanguage":"en","wgPageContentLanguage":"en","wgPageContentModel":"wikitext","wgRelevantPageName":"Relative_risk","wgRelevantArticleId":2622159,"wgIsProbablyEditable":true,"wgRelevantPageIsProbablyEditable":true,"wgRestrictionEdit":[],"wgRestrictionMove":[],"wgNoticeProject":"wikipedia","wgCiteReferencePreviewsActive":false,"wgFlaggedRevsParams":{"tags":{"status":{"levels":1}}},"wgMediaViewerOnClick":true,"wgMediaViewerEnabledByDefault":true,"wgPopupsFlags":0,"wgVisualEditor":{"pageLanguageCode":"en","pageLanguageDir":"ltr","pageVariantFallbacks":"en"},"wgMFDisplayWikibaseDescriptions":{"search":true,"watchlist":true,"tagline":false,"nearby":true},"wgWMESchemaEditAttemptStepOversample":false,"wgWMEPageLength":10000,"wgRelatedArticlesCompat":[],"wgCentralAuthMobileDomain":false,"wgEditSubmitButtonLabelPublish":true,"wgULSPosition":"interlanguage","wgULSisCompactLinksEnabled":false,"wgVector2022LanguageInHeader":true,"wgULSisLanguageSelectorEmpty":false, "wgWikibaseItemId":"Q2142611","wgCheckUserClientHintsHeadersJsApi":["brands","architecture","bitness","fullVersionList","mobile","model","platform","platformVersion"],"GEHomepageSuggestedEditsEnableTopics":true,"wgGETopicsMatchModeEnabled":false,"wgGEStructuredTaskRejectionReasonTextInputEnabled":false,"wgGELevelingUpEnabledForUser":false};RLSTATE={"ext.globalCssJs.user.styles":"ready","site.styles":"ready","user.styles":"ready","ext.globalCssJs.user":"ready","user":"ready","user.options":"loading","ext.cite.styles":"ready","ext.math.styles":"ready","skins.vector.search.codex.styles":"ready","skins.vector.styles":"ready","skins.vector.icons":"ready","jquery.makeCollapsible.styles":"ready","ext.wikimediamessages.styles":"ready","ext.visualEditor.desktopArticleTarget.noscript":"ready","ext.uls.interlanguage":"ready","wikibase.client.init":"ready","ext.wikimediaBadges":"ready"};RLPAGEMODULES=["ext.cite.ux-enhancements","mediawiki.page.media","site","mediawiki.page.ready", "jquery.makeCollapsible","mediawiki.toc","skins.vector.js","ext.centralNotice.geoIP","ext.centralNotice.startUp","ext.gadget.ReferenceTooltips","ext.gadget.switcher","ext.urlShortener.toolbar","ext.centralauth.centralautologin","mmv.bootstrap","ext.popups","ext.visualEditor.desktopArticleTarget.init","ext.visualEditor.targetLoader","ext.echo.centralauth","ext.eventLogging","ext.wikimediaEvents","ext.navigationTiming","ext.uls.interface","ext.cx.eventlogging.campaigns","ext.cx.uls.quick.actions","wikibase.client.vector-2022","ext.checkUser.clientHints","ext.growthExperiments.SuggestedEditSession","wikibase.sidebar.tracking"];</script> <script>(RLQ=window.RLQ||[]).push(function(){mw.loader.impl(function(){return["user.options@12s5i",function($,jQuery,require,module){mw.user.tokens.set({"patrolToken":"+\\","watchToken":"+\\","csrfToken":"+\\"}); }];});});</script> <link rel="stylesheet" href="/w/load.php?lang=en&modules=ext.cite.styles%7Cext.math.styles%7Cext.uls.interlanguage%7Cext.visualEditor.desktopArticleTarget.noscript%7Cext.wikimediaBadges%7Cext.wikimediamessages.styles%7Cjquery.makeCollapsible.styles%7Cskins.vector.icons%2Cstyles%7Cskins.vector.search.codex.styles%7Cwikibase.client.init&only=styles&skin=vector-2022"> <script async="" src="/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=vector-2022"></script> <meta name="ResourceLoaderDynamicStyles" content=""> <link rel="stylesheet" href="/w/load.php?lang=en&modules=site.styles&only=styles&skin=vector-2022"> <meta name="generator" content="MediaWiki 1.44.0-wmf.4"> <meta name="referrer" content="origin"> <meta name="referrer" content="origin-when-cross-origin"> <meta name="robots" content="max-image-preview:standard"> <meta name="format-detection" content="telephone=no"> <meta property="og:image" content="https://upload.wikimedia.org/wikipedia/commons/thumb/5/5d/Illustration_of_risk_reduction.svg/1200px-Illustration_of_risk_reduction.svg.png"> <meta property="og:image:width" content="1200"> <meta property="og:image:height" content="978"> <meta property="og:image" content="https://upload.wikimedia.org/wikipedia/commons/thumb/5/5d/Illustration_of_risk_reduction.svg/800px-Illustration_of_risk_reduction.svg.png"> <meta property="og:image:width" content="800"> <meta property="og:image:height" content="652"> <meta property="og:image" content="https://upload.wikimedia.org/wikipedia/commons/thumb/5/5d/Illustration_of_risk_reduction.svg/640px-Illustration_of_risk_reduction.svg.png"> <meta property="og:image:width" content="640"> <meta property="og:image:height" content="522"> <meta name="viewport" content="width=1120"> <meta property="og:title" content="Relative risk - Wikipedia"> <meta property="og:type" content="website"> <link rel="preconnect" href="//upload.wikimedia.org"> <link rel="alternate" media="only screen and (max-width: 640px)" href="//en.m.wikipedia.org/wiki/Relative_risk"> <link rel="alternate" type="application/x-wiki" title="Edit this page" href="/w/index.php?title=Relative_risk&action=edit"> <link rel="apple-touch-icon" href="/static/apple-touch/wikipedia.png"> <link rel="icon" href="/static/favicon/wikipedia.ico"> <link rel="search" type="application/opensearchdescription+xml" href="/w/rest.php/v1/search" title="Wikipedia (en)"> <link rel="EditURI" type="application/rsd+xml" href="//en.wikipedia.org/w/api.php?action=rsd"> <link rel="canonical" href="https://en.wikipedia.org/wiki/Relative_risk"> <link rel="license" href="https://creativecommons.org/licenses/by-sa/4.0/deed.en"> <link rel="alternate" type="application/atom+xml" title="Wikipedia Atom feed" href="/w/index.php?title=Special:RecentChanges&feed=atom"> <link rel="dns-prefetch" href="//meta.wikimedia.org" /> <link rel="dns-prefetch" href="//login.wikimedia.org"> </head> <body class="skin--responsive skin-vector skin-vector-search-vue mediawiki ltr sitedir-ltr mw-hide-empty-elt ns-0 ns-subject mw-editable page-Relative_risk rootpage-Relative_risk skin-vector-2022 action-view"><a class="mw-jump-link" href="#bodyContent">Jump to content</a> <div class="vector-header-container"> <header class="vector-header mw-header"> <div class="vector-header-start"> <nav class="vector-main-menu-landmark" aria-label="Site"> <div id="vector-main-menu-dropdown" class="vector-dropdown vector-main-menu-dropdown vector-button-flush-left vector-button-flush-right" > <input type="checkbox" id="vector-main-menu-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-main-menu-dropdown" class="vector-dropdown-checkbox " aria-label="Main menu" > <label id="vector-main-menu-dropdown-label" for="vector-main-menu-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-menu mw-ui-icon-wikimedia-menu"></span> <span class="vector-dropdown-label-text">Main menu</span> </label> <div class="vector-dropdown-content"> <div id="vector-main-menu-unpinned-container" class="vector-unpinned-container"> <div id="vector-main-menu" class="vector-main-menu vector-pinnable-element"> <div class="vector-pinnable-header vector-main-menu-pinnable-header vector-pinnable-header-unpinned" data-feature-name="main-menu-pinned" data-pinnable-element-id="vector-main-menu" data-pinned-container-id="vector-main-menu-pinned-container" data-unpinned-container-id="vector-main-menu-unpinned-container" > <div class="vector-pinnable-header-label">Main menu</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-main-menu.pin">move to sidebar</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-main-menu.unpin">hide</button> </div> <div id="p-navigation" class="vector-menu mw-portlet mw-portlet-navigation" > <div class="vector-menu-heading"> Navigation </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="n-mainpage-description" class="mw-list-item"><a href="/wiki/Main_Page" title="Visit the main page [z]" accesskey="z"><span>Main page</span></a></li><li id="n-contents" class="mw-list-item"><a href="/wiki/Wikipedia:Contents" title="Guides to browsing Wikipedia"><span>Contents</span></a></li><li id="n-currentevents" class="mw-list-item"><a href="/wiki/Portal:Current_events" title="Articles related to current events"><span>Current events</span></a></li><li id="n-randompage" class="mw-list-item"><a href="/wiki/Special:Random" title="Visit a randomly selected article [x]" accesskey="x"><span>Random article</span></a></li><li id="n-aboutsite" class="mw-list-item"><a href="/wiki/Wikipedia:About" title="Learn about Wikipedia and how it works"><span>About Wikipedia</span></a></li><li id="n-contactpage" class="mw-list-item"><a href="//en.wikipedia.org/wiki/Wikipedia:Contact_us" title="How to contact Wikipedia"><span>Contact us</span></a></li> </ul> </div> </div> <div id="p-interaction" class="vector-menu mw-portlet mw-portlet-interaction" > <div class="vector-menu-heading"> Contribute </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="n-help" class="mw-list-item"><a href="/wiki/Help:Contents" title="Guidance on how to use and edit Wikipedia"><span>Help</span></a></li><li id="n-introduction" class="mw-list-item"><a href="/wiki/Help:Introduction" title="Learn how to edit Wikipedia"><span>Learn to edit</span></a></li><li id="n-portal" class="mw-list-item"><a href="/wiki/Wikipedia:Community_portal" title="The hub for editors"><span>Community portal</span></a></li><li id="n-recentchanges" class="mw-list-item"><a href="/wiki/Special:RecentChanges" title="A list of recent changes to Wikipedia [r]" accesskey="r"><span>Recent changes</span></a></li><li id="n-upload" class="mw-list-item"><a href="/wiki/Wikipedia:File_upload_wizard" title="Add images or other media for use on Wikipedia"><span>Upload file</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> <a href="/wiki/Main_Page" class="mw-logo"> <img class="mw-logo-icon" src="/static/images/icons/wikipedia.png" alt="" aria-hidden="true" height="50" width="50"> <span class="mw-logo-container skin-invert"> <img class="mw-logo-wordmark" alt="Wikipedia" src="/static/images/mobile/copyright/wikipedia-wordmark-en.svg" style="width: 7.5em; height: 1.125em;"> <img class="mw-logo-tagline" alt="The Free Encyclopedia" src="/static/images/mobile/copyright/wikipedia-tagline-en.svg" width="117" height="13" style="width: 7.3125em; height: 0.8125em;"> </span> </a> </div> <div class="vector-header-end"> <div id="p-search" role="search" class="vector-search-box-vue vector-search-box-collapses vector-search-box-show-thumbnail vector-search-box-auto-expand-width vector-search-box"> <a href="/wiki/Special:Search" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only search-toggle" title="Search Wikipedia [f]" accesskey="f"><span class="vector-icon mw-ui-icon-search mw-ui-icon-wikimedia-search"></span> <span>Search</span> </a> <div class="vector-typeahead-search-container"> <div class="cdx-typeahead-search cdx-typeahead-search--show-thumbnail cdx-typeahead-search--auto-expand-width"> <form action="/w/index.php" id="searchform" class="cdx-search-input cdx-search-input--has-end-button"> <div id="simpleSearch" class="cdx-search-input__input-wrapper" data-search-loc="header-moved"> <div class="cdx-text-input cdx-text-input--has-start-icon"> <input class="cdx-text-input__input" type="search" name="search" placeholder="Search Wikipedia" aria-label="Search Wikipedia" autocapitalize="sentences" title="Search Wikipedia [f]" accesskey="f" id="searchInput" > <span class="cdx-text-input__icon cdx-text-input__start-icon"></span> </div> <input type="hidden" name="title" value="Special:Search"> </div> <button class="cdx-button cdx-search-input__end-button">Search</button> </form> </div> </div> </div> <nav class="vector-user-links vector-user-links-wide" aria-label="Personal tools"> <div class="vector-user-links-main"> <div id="p-vector-user-menu-preferences" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <div id="p-vector-user-menu-userpage" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <nav class="vector-appearance-landmark" aria-label="Appearance"> <div id="vector-appearance-dropdown" class="vector-dropdown " title="Change the appearance of the page's font size, width, and color" > <input type="checkbox" id="vector-appearance-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-appearance-dropdown" class="vector-dropdown-checkbox " aria-label="Appearance" > <label id="vector-appearance-dropdown-label" for="vector-appearance-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-appearance mw-ui-icon-wikimedia-appearance"></span> <span class="vector-dropdown-label-text">Appearance</span> </label> <div class="vector-dropdown-content"> <div id="vector-appearance-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <div id="p-vector-user-menu-notifications" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <div id="p-vector-user-menu-overflow" class="vector-menu mw-portlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-sitesupport-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="https://donate.wikimedia.org/wiki/Special:FundraiserRedirector?utm_source=donate&utm_medium=sidebar&utm_campaign=C13_en.wikipedia.org&uselang=en" class=""><span>Donate</span></a> </li> <li id="pt-createaccount-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=Special:CreateAccount&returnto=Relative+risk" title="You are encouraged to create an account and log in; however, it is not mandatory" class=""><span>Create account</span></a> </li> <li id="pt-login-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=Special:UserLogin&returnto=Relative+risk" title="You're encouraged to log in; however, it's not mandatory. [o]" accesskey="o" class=""><span>Log in</span></a> </li> </ul> </div> </div> </div> <div id="vector-user-links-dropdown" class="vector-dropdown vector-user-menu vector-button-flush-right vector-user-menu-logged-out" title="Log in and more options" > <input type="checkbox" id="vector-user-links-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-user-links-dropdown" class="vector-dropdown-checkbox " aria-label="Personal tools" > <label id="vector-user-links-dropdown-label" for="vector-user-links-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-ellipsis mw-ui-icon-wikimedia-ellipsis"></span> <span class="vector-dropdown-label-text">Personal tools</span> </label> <div class="vector-dropdown-content"> <div id="p-personal" class="vector-menu mw-portlet mw-portlet-personal user-links-collapsible-item" title="User menu" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-sitesupport" class="user-links-collapsible-item mw-list-item"><a href="https://donate.wikimedia.org/wiki/Special:FundraiserRedirector?utm_source=donate&utm_medium=sidebar&utm_campaign=C13_en.wikipedia.org&uselang=en"><span>Donate</span></a></li><li id="pt-createaccount" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Special:CreateAccount&returnto=Relative+risk" title="You are encouraged to create an account and log in; however, it is not mandatory"><span class="vector-icon mw-ui-icon-userAdd mw-ui-icon-wikimedia-userAdd"></span> <span>Create account</span></a></li><li id="pt-login" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Special:UserLogin&returnto=Relative+risk" title="You're encouraged to log in; however, it's not mandatory. [o]" accesskey="o"><span class="vector-icon mw-ui-icon-logIn mw-ui-icon-wikimedia-logIn"></span> <span>Log in</span></a></li> </ul> </div> </div> <div id="p-user-menu-anon-editor" class="vector-menu mw-portlet mw-portlet-user-menu-anon-editor" > <div class="vector-menu-heading"> Pages for logged out editors <a href="/wiki/Help:Introduction" aria-label="Learn more about editing"><span>learn more</span></a> </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-anoncontribs" class="mw-list-item"><a href="/wiki/Special:MyContributions" title="A list of edits made from this IP address [y]" accesskey="y"><span>Contributions</span></a></li><li id="pt-anontalk" class="mw-list-item"><a href="/wiki/Special:MyTalk" title="Discussion about edits from this IP address [n]" accesskey="n"><span>Talk</span></a></li> </ul> </div> </div> </div> </div> </nav> </div> </header> </div> <div class="mw-page-container"> <div class="mw-page-container-inner"> <div class="vector-sitenotice-container"> <div id="siteNotice"></div> </div> <div class="vector-column-start"> <div class="vector-main-menu-container"> <div id="mw-navigation"> <nav id="mw-panel" class="vector-main-menu-landmark" aria-label="Site"> <div id="vector-main-menu-pinned-container" class="vector-pinned-container"> </div> </nav> </div> </div> <div class="vector-sticky-pinned-container"> <nav id="mw-panel-toc" aria-label="Contents" data-event-name="ui.sidebar-toc" class="mw-table-of-contents-container vector-toc-landmark"> <div id="vector-toc-pinned-container" class="vector-pinned-container"> <div id="vector-toc" class="vector-toc vector-pinnable-element"> <div class="vector-pinnable-header vector-toc-pinnable-header vector-pinnable-header-pinned" data-feature-name="toc-pinned" data-pinnable-element-id="vector-toc" > <h2 class="vector-pinnable-header-label">Contents</h2> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">move to sidebar</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">hide</button> </div> <ul class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">(Top)</div> </a> </li> <li id="toc-Statistical_use_and_meaning" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Statistical_use_and_meaning"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Statistical use and meaning</span> </div> </a> <ul id="toc-Statistical_use_and_meaning-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Usage_in_reporting" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Usage_in_reporting"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Usage in reporting</span> </div> </a> <ul id="toc-Usage_in_reporting-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Inference" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Inference"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Inference</span> </div> </a> <ul id="toc-Inference-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Comparison_to_the_odds_ratio" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Comparison_to_the_odds_ratio"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Comparison to the odds ratio</span> </div> </a> <ul id="toc-Comparison_to_the_odds_ratio-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Bayesian_interpretation" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Bayesian_interpretation"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Bayesian interpretation</span> </div> </a> <ul id="toc-Bayesian_interpretation-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Numerical_example" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Numerical_example"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>Numerical example</span> </div> </a> <ul id="toc-Numerical_example-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-See_also" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#See_also"> <div class="vector-toc-text"> <span class="vector-toc-numb">7</span> <span>See also</span> </div> </a> <ul id="toc-See_also-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> <span class="vector-toc-numb">8</span> <span>References</span> </div> </a> <ul id="toc-References-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-External_links" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#External_links"> <div class="vector-toc-text"> <span class="vector-toc-numb">9</span> <span>External links</span> </div> </a> <ul id="toc-External_links-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contents" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Toggle the table of contents" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Toggle the table of contents</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Relative risk</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Go to an article in another language. Available in 24 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-24" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">24 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%AE%D8%B7%D8%B1_%D9%86%D8%B3%D8%A8%D9%8A" title="خطر نسبي – Arabic" lang="ar" hreflang="ar" data-title="خطر نسبي" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%90%D0%B4%D0%BD%D0%BE%D1%81%D1%96%D0%BD%D1%8B_%D1%80%D1%8B%D0%B7%D1%8B%D0%BA" title="Адносіны рызык – Belarusian" lang="be" hreflang="be" data-title="Адносіны рызык" data-language-autonym="Беларуская" data-language-local-name="Belarusian" class="interlanguage-link-target"><span>Беларуская</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Risc_relatiu" title="Risc relatiu – Catalan" lang="ca" hreflang="ca" data-title="Risc relatiu" data-language-autonym="Català" data-language-local-name="Catalan" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/Relativ_risiko" title="Relativ risiko – Danish" lang="da" hreflang="da" data-title="Relativ risiko" data-language-autonym="Dansk" data-language-local-name="Danish" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Relatives_Risiko" title="Relatives Risiko – German" lang="de" hreflang="de" data-title="Relatives Risiko" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%A3%CF%87%CE%B5%CF%84%CE%B9%CE%BA%CF%8C%CF%82_%CE%BA%CE%AF%CE%BD%CE%B4%CF%85%CE%BD%CE%BF%CF%82" title="Σχετικός κίνδυνος – Greek" lang="el" hreflang="el" data-title="Σχετικός κίνδυνος" data-language-autonym="Ελληνικά" data-language-local-name="Greek" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Riesgo_relativo" title="Riesgo relativo – Spanish" lang="es" hreflang="es" data-title="Riesgo relativo" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Risque_relatif" title="Risque relatif – French" lang="fr" hreflang="fr" data-title="Risque relatif" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%83%81%EB%8C%80%EC%9C%84%ED%97%98%EB%8F%84" title="상대위험도 – Korean" lang="ko" hreflang="ko" data-title="상대위험도" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Rischio_relativo" title="Rischio relativo – Italian" lang="it" hreflang="it" data-title="Rischio relativo" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%A1%D7%99%D7%9B%D7%95%D7%9F_%D7%99%D7%97%D7%A1%D7%99" title="סיכון יחסי – Hebrew" lang="he" hreflang="he" data-title="סיכון יחסי" data-language-autonym="עברית" data-language-local-name="Hebrew" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/Santykin%C4%97_rizika" title="Santykinė rizika – Lithuanian" lang="lt" hreflang="lt" data-title="Santykinė rizika" data-language-autonym="Lietuvių" data-language-local-name="Lithuanian" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/Relat%C3%ADv_kock%C3%A1zat" title="Relatív kockázat – Hungarian" lang="hu" hreflang="hu" data-title="Relatív kockázat" data-language-autonym="Magyar" data-language-local-name="Hungarian" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Relatief_risico" title="Relatief risico – Dutch" lang="nl" hreflang="nl" data-title="Relatief risico" data-language-autonym="Nederlands" data-language-local-name="Dutch" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E7%9B%B8%E5%AF%BE%E5%8D%B1%E9%99%BA%E5%BA%A6" title="相対危険度 – Japanese" lang="ja" hreflang="ja" data-title="相対危険度" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Relativ_risiko" title="Relativ risiko – Norwegian Bokmål" lang="nb" hreflang="nb" data-title="Relativ risiko" data-language-autonym="Norsk bokmål" data-language-local-name="Norwegian Bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Ryzyko_wzgl%C4%99dne" title="Ryzyko względne – Polish" lang="pl" hreflang="pl" data-title="Ryzyko względne" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Risco_relativo" title="Risco relativo – Portuguese" lang="pt" hreflang="pt" data-title="Risco relativo" data-language-autonym="Português" data-language-local-name="Portuguese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%9E%D1%82%D0%BD%D0%BE%D1%81%D0%B8%D1%82%D0%B5%D0%BB%D1%8C%D0%BD%D1%8B%D0%B9_%D1%80%D0%B8%D1%81%D0%BA" title="Относительный риск – Russian" lang="ru" hreflang="ru" data-title="Относительный риск" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B8%84%E0%B8%A7%E0%B8%B2%E0%B8%A1%E0%B9%80%E0%B8%AA%E0%B8%B5%E0%B9%88%E0%B8%A2%E0%B8%87%E0%B8%AA%E0%B8%B1%E0%B8%A1%E0%B8%9E%E0%B8%B1%E0%B8%97%E0%B8%98%E0%B9%8C" title="ความเสี่ยงสัมพัทธ์ – Thai" lang="th" hreflang="th" data-title="ความเสี่ยงสัมพัทธ์" data-language-autonym="ไทย" data-language-local-name="Thai" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/G%C3%B6receli_risk" title="Göreceli risk – Turkish" lang="tr" hreflang="tr" data-title="Göreceli risk" data-language-autonym="Türkçe" data-language-local-name="Turkish" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%92%D1%96%D0%B4%D0%BD%D0%BE%D1%81%D0%BD%D0%B8%D0%B9_%D1%80%D0%B8%D0%B7%D0%B8%D0%BA" title="Відносний ризик – Ukrainian" lang="uk" hreflang="uk" data-title="Відносний ризик" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/T%E1%BB%B7_s%E1%BB%91_nguy_c%C6%A1" title="Tỷ số nguy cơ – Vietnamese" lang="vi" hreflang="vi" data-title="Tỷ số nguy cơ" data-language-autonym="Tiếng Việt" data-language-local-name="Vietnamese" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E7%9B%B8%E5%B0%8D%E9%A2%A8%E9%9A%AA" title="相對風險 – Chinese" lang="zh" hreflang="zh" data-title="相對風險" data-language-autonym="中文" data-language-local-name="Chinese" class="interlanguage-link-target"><span>中文</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q2142611#sitelinks-wikipedia" title="Edit interlanguage links" class="wbc-editpage">Edit links</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Namespaces"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Relative_risk" title="View the content page [c]" accesskey="c"><span>Article</span></a></li><li id="ca-talk" class="vector-tab-noicon mw-list-item"><a href="/wiki/Talk:Relative_risk" rel="discussion" title="Discuss improvements to the content page [t]" accesskey="t"><span>Talk</span></a></li> </ul> </div> </div> <div id="vector-variants-dropdown" class="vector-dropdown emptyPortlet" > <input type="checkbox" id="vector-variants-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-variants-dropdown" class="vector-dropdown-checkbox " aria-label="Change language variant" > <label id="vector-variants-dropdown-label" for="vector-variants-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">English</span> </label> <div class="vector-dropdown-content"> <div id="p-variants" class="vector-menu mw-portlet mw-portlet-variants emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> </div> </div> </nav> </div> <div id="right-navigation" class="vector-collapsible"> <nav aria-label="Views"> <div id="p-views" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-views" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-view" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Relative_risk"><span>Read</span></a></li><li id="ca-edit" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Relative_risk&action=edit" title="Edit this page [e]" accesskey="e"><span>Edit</span></a></li><li id="ca-history" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Relative_risk&action=history" title="Past revisions of this page [h]" accesskey="h"><span>View history</span></a></li> </ul> </div> </div> </nav> <nav class="vector-page-tools-landmark" aria-label="Page tools"> <div id="vector-page-tools-dropdown" class="vector-dropdown vector-page-tools-dropdown" > <input type="checkbox" id="vector-page-tools-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-tools-dropdown" class="vector-dropdown-checkbox " aria-label="Tools" > <label id="vector-page-tools-dropdown-label" for="vector-page-tools-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">Tools</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-tools-unpinned-container" class="vector-unpinned-container"> <div id="vector-page-tools" class="vector-page-tools vector-pinnable-element"> <div class="vector-pinnable-header vector-page-tools-pinnable-header vector-pinnable-header-unpinned" data-feature-name="page-tools-pinned" data-pinnable-element-id="vector-page-tools" data-pinned-container-id="vector-page-tools-pinned-container" data-unpinned-container-id="vector-page-tools-unpinned-container" > <div class="vector-pinnable-header-label">Tools</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-page-tools.pin">move to sidebar</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-page-tools.unpin">hide</button> </div> <div id="p-cactions" class="vector-menu mw-portlet mw-portlet-cactions emptyPortlet vector-has-collapsible-items" title="More options" > <div class="vector-menu-heading"> Actions </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-more-view" class="selected vector-more-collapsible-item mw-list-item"><a href="/wiki/Relative_risk"><span>Read</span></a></li><li id="ca-more-edit" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=Relative_risk&action=edit" title="Edit this page [e]" accesskey="e"><span>Edit</span></a></li><li id="ca-more-history" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=Relative_risk&action=history"><span>View history</span></a></li> </ul> </div> </div> <div id="p-tb" class="vector-menu mw-portlet mw-portlet-tb" > <div class="vector-menu-heading"> General </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="t-whatlinkshere" class="mw-list-item"><a href="/wiki/Special:WhatLinksHere/Relative_risk" title="List of all English Wikipedia pages containing links to this page [j]" accesskey="j"><span>What links here</span></a></li><li id="t-recentchangeslinked" class="mw-list-item"><a href="/wiki/Special:RecentChangesLinked/Relative_risk" rel="nofollow" title="Recent changes in pages linked from this page [k]" accesskey="k"><span>Related changes</span></a></li><li id="t-upload" class="mw-list-item"><a href="/wiki/Wikipedia:File_Upload_Wizard" title="Upload files [u]" accesskey="u"><span>Upload file</span></a></li><li id="t-specialpages" class="mw-list-item"><a href="/wiki/Special:SpecialPages" title="A list of all special pages [q]" accesskey="q"><span>Special pages</span></a></li><li id="t-permalink" class="mw-list-item"><a href="/w/index.php?title=Relative_risk&oldid=1249344067" title="Permanent link to this revision of this page"><span>Permanent link</span></a></li><li id="t-info" class="mw-list-item"><a href="/w/index.php?title=Relative_risk&action=info" title="More information about this page"><span>Page information</span></a></li><li id="t-cite" class="mw-list-item"><a href="/w/index.php?title=Special:CiteThisPage&page=Relative_risk&id=1249344067&wpFormIdentifier=titleform" title="Information on how to cite this page"><span>Cite this page</span></a></li><li id="t-urlshortener" class="mw-list-item"><a href="/w/index.php?title=Special:UrlShortener&url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FRelative_risk"><span>Get shortened URL</span></a></li><li id="t-urlshortener-qrcode" class="mw-list-item"><a href="/w/index.php?title=Special:QrCode&url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FRelative_risk"><span>Download QR code</span></a></li> </ul> </div> </div> <div id="p-coll-print_export" class="vector-menu mw-portlet mw-portlet-coll-print_export" > <div class="vector-menu-heading"> Print/export </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="coll-download-as-rl" class="mw-list-item"><a href="/w/index.php?title=Special:DownloadAsPdf&page=Relative_risk&action=show-download-screen" title="Download this page as a PDF file"><span>Download as PDF</span></a></li><li id="t-print" class="mw-list-item"><a href="/w/index.php?title=Relative_risk&printable=yes" title="Printable version of this page [p]" accesskey="p"><span>Printable version</span></a></li> </ul> </div> </div> <div id="p-wikibase-otherprojects" class="vector-menu mw-portlet mw-portlet-wikibase-otherprojects" > <div class="vector-menu-heading"> In other projects </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="wb-otherproject-link wb-otherproject-commons mw-list-item"><a href="https://commons.wikimedia.org/wiki/Category:Statistics_for_relative_risk" hreflang="en"><span>Wikimedia Commons</span></a></li><li id="t-wikibase" class="wb-otherproject-link wb-otherproject-wikibase-dataitem mw-list-item"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q2142611" title="Structured data on this page hosted by Wikidata [g]" accesskey="g"><span>Wikidata item</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> </div> </div> </div> <div class="vector-column-end"> <div class="vector-sticky-pinned-container"> <nav class="vector-page-tools-landmark" aria-label="Page tools"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="Appearance"> <div id="vector-appearance-pinned-container" class="vector-pinned-container"> <div id="vector-appearance" class="vector-appearance vector-pinnable-element"> <div class="vector-pinnable-header vector-appearance-pinnable-header vector-pinnable-header-pinned" data-feature-name="appearance-pinned" data-pinnable-element-id="vector-appearance" data-pinned-container-id="vector-appearance-pinned-container" data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">Appearance</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">move to sidebar</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">hide</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Measure of association used in epidemiology</div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Illustration_of_risk_reduction.svg" class="mw-file-description"><img alt="Illustration of two groups: one exposed to treatment, and one unexposed. Exposed group has smaller risk of adverse outcome, with RR = 4/8 = 0.5." src="//upload.wikimedia.org/wikipedia/commons/thumb/5/5d/Illustration_of_risk_reduction.svg/220px-Illustration_of_risk_reduction.svg.png" decoding="async" width="220" height="179" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/5d/Illustration_of_risk_reduction.svg/330px-Illustration_of_risk_reduction.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/5d/Illustration_of_risk_reduction.svg/440px-Illustration_of_risk_reduction.svg.png 2x" data-file-width="482" data-file-height="393" /></a><figcaption>The group exposed to treatment (left) has half the risk (RR = 4/8 = 0.5) of an adverse outcome (black) compared to the unexposed group (right).</figcaption></figure> <p>The <b>relative risk (RR)</b> or <b>risk ratio</b> is the ratio of the <a href="/wiki/Probability" title="Probability">probability</a> of an outcome in an exposed group to the probability of an outcome in an unexposed group. Together with <a href="/wiki/Risk_difference" title="Risk difference">risk difference</a> and <a href="/wiki/Odds_ratio" title="Odds ratio">odds ratio</a>, relative risk measures the association between the exposure and the outcome.<sup id="cite_ref-pmid14695382_1-0" class="reference"><a href="#cite_note-pmid14695382-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Statistical_use_and_meaning">Statistical use and meaning</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Relative_risk&action=edit&section=1" title="Edit section: Statistical use and meaning"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Relative risk is used in the statistical analysis of the data of <a href="/wiki/Ecological_study" title="Ecological study">ecological</a>, <a href="/wiki/Cohort_study" title="Cohort study">cohort</a>, medical and intervention studies, to estimate the strength of the association between exposures (treatments or risk factors) and outcomes.<sup id="cite_ref-:2_2-0" class="reference"><a href="#cite_note-:2-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> Mathematically, it is the incidence rate of the outcome in the exposed group, <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle I_{e}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>I</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>e</mi> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle I_{e}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/a142c83ab0d8997cd19754da522bcedda6579d07" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:2.022ex; height:2.509ex;" alt="{\displaystyle I_{e}}"></span>, divided by the rate of the unexposed group, <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle I_{u}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>I</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>u</mi> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle I_{u}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/1331605a949f78d851bac7950675dfefbc7f8afa" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:2.196ex; height:2.509ex;" alt="{\displaystyle I_{u}}"></span>.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> As such, it is used to compare the risk of an adverse outcome when receiving a medical treatment versus no treatment (or placebo), or for environmental risk factors. For example, in a study examining the effect of the drug apixaban on the occurrence of thromboembolism, 8.8% of placebo-treated patients experienced the disease, but only 1.7% of patients treated with the drug did, so the relative risk is .19 (1.7/8.8): patients receiving apixaban had 19% the disease risk of patients receiving the placebo.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> In this case, apixaban is a <a href="/wiki/Protective_factor" title="Protective factor">protective factor</a> rather than a <a href="/wiki/Risk_factor" title="Risk factor">risk factor</a>, because it reduces the risk of disease. </p><p>Assuming the causal effect between the exposure and the outcome, values of relative risk can be interpreted as follows:<sup id="cite_ref-:2_2-1" class="reference"><a href="#cite_note-:2-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </p> <ul><li>RR = 1 means that exposure does not affect the outcome</li> <li>RR < 1 means that the risk of the outcome is decreased by the exposure, which is a "<a href="/wiki/Protective_factor" title="Protective factor">protective factor</a>"</li> <li>RR > 1 means that the risk of the outcome is increased by the exposure, which is a "<a href="/wiki/Risk_factor" title="Risk factor">risk factor</a>"</li></ul> <p>As always, correlation does not mean causation; the causation could be reversed, or they could both be caused by a common <a href="/wiki/Confounding" title="Confounding">confounding variable</a>. The relative risk of having cancer when in the hospital versus at home, for example, would be greater than 1, but that is because having cancer causes people to go to the hospital. </p> <div class="mw-heading mw-heading2"><h2 id="Usage_in_reporting">Usage in reporting</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Relative_risk&action=edit&section=2" title="Edit section: Usage in reporting"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Relative risk is commonly used to present the results of randomized controlled trials.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> This can be problematic if the relative risk is presented without the absolute measures, such as <a href="/wiki/Absolute_risk" title="Absolute risk">absolute risk</a>, or risk difference.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> In cases where the base rate of the outcome is low, large or small values of relative risk may not translate to significant effects, and the importance of the effects to the public health can be overestimated. Equivalently, in cases where the base rate of the outcome is high, values of the relative risk close to 1 may still result in a significant effect, and their effects can be underestimated. Thus, presentation of both absolute and relative measures is recommended.<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Inference">Inference</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Relative_risk&action=edit&section=3" title="Edit section: Inference"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Relative risk can be estimated from a 2×2 <a href="/wiki/Contingency_table" title="Contingency table">contingency table</a>: </p> <table class="wikitable"> <tbody><tr> <th rowspan="2">  </th> <th colspan="2">Group </th></tr> <tr> <th>Intervention (I) </th> <th><a href="/wiki/Scientific_control" title="Scientific control">Control</a> (C) </th></tr> <tr> <td>Events (E) </td> <td>IE </td> <td>CE </td></tr> <tr> <td>Non-events (N) </td> <td>IN </td> <td>CN </td></tr></tbody></table> <p>The point estimate of the relative risk is </p> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle RR={\frac {IE/(IE+IN)}{CE/(CE+CN)}}={\frac {IE(CE+CN)}{CE(IE+IN)}}.}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>R</mi> <mi>R</mi> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mi>I</mi> <mi>E</mi> <mrow class="MJX-TeXAtom-ORD"> <mo>/</mo> </mrow> <mo stretchy="false">(</mo> <mi>I</mi> <mi>E</mi> <mo>+</mo> <mi>I</mi> <mi>N</mi> <mo stretchy="false">)</mo> </mrow> <mrow> <mi>C</mi> <mi>E</mi> <mrow class="MJX-TeXAtom-ORD"> <mo>/</mo> </mrow> <mo stretchy="false">(</mo> <mi>C</mi> <mi>E</mi> <mo>+</mo> <mi>C</mi> <mi>N</mi> <mo stretchy="false">)</mo> </mrow> </mfrac> </mrow> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mi>I</mi> <mi>E</mi> <mo stretchy="false">(</mo> <mi>C</mi> <mi>E</mi> <mo>+</mo> <mi>C</mi> <mi>N</mi> <mo stretchy="false">)</mo> </mrow> <mrow> <mi>C</mi> <mi>E</mi> <mo stretchy="false">(</mo> <mi>I</mi> <mi>E</mi> <mo>+</mo> <mi>I</mi> <mi>N</mi> <mo stretchy="false">)</mo> </mrow> </mfrac> </mrow> <mo>.</mo> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle RR={\frac {IE/(IE+IN)}{CE/(CE+CN)}}={\frac {IE(CE+CN)}{CE(IE+IN)}}.}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/ea0e2e880441ea6fadcd75f34d849b278757e911" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.671ex; width:43.739ex; height:6.509ex;" alt="{\displaystyle RR={\frac {IE/(IE+IN)}{CE/(CE+CN)}}={\frac {IE(CE+CN)}{CE(IE+IN)}}.}"></span></dd></dl> <p>The sampling distribution of the <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \log(RR)}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>log</mi> <mo>⁡</mo> <mo stretchy="false">(</mo> <mi>R</mi> <mi>R</mi> <mo stretchy="false">)</mo> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \log(RR)}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/060c4ba35cdc4858ec503b7e6a92e85a63d1371d" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:8.309ex; height:2.843ex;" alt="{\displaystyle \log(RR)}"></span> is closer to normal than the distribution of RR,<sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> with standard error </p> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle SE(\log(RR))={\sqrt {{\frac {IN}{IE(IE+IN)}}+{\frac {CN}{CE(CE+CN)}}}}.}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>S</mi> <mi>E</mi> <mo stretchy="false">(</mo> <mi>log</mi> <mo>⁡</mo> <mo stretchy="false">(</mo> <mi>R</mi> <mi>R</mi> <mo stretchy="false">)</mo> <mo stretchy="false">)</mo> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <msqrt> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mi>I</mi> <mi>N</mi> </mrow> <mrow> <mi>I</mi> <mi>E</mi> <mo stretchy="false">(</mo> <mi>I</mi> <mi>E</mi> <mo>+</mo> <mi>I</mi> <mi>N</mi> <mo stretchy="false">)</mo> </mrow> </mfrac> </mrow> <mo>+</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mi>C</mi> <mi>N</mi> </mrow> <mrow> <mi>C</mi> <mi>E</mi> <mo stretchy="false">(</mo> <mi>C</mi> <mi>E</mi> <mo>+</mo> <mi>C</mi> <mi>N</mi> <mo stretchy="false">)</mo> </mrow> </mfrac> </mrow> </msqrt> </mrow> <mo>.</mo> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle SE(\log(RR))={\sqrt {{\frac {IN}{IE(IE+IN)}}+{\frac {CN}{CE(CE+CN)}}}}.}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/d18048a9b522e06b9b3051ef2c3ef30ff84f7e32" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -3.338ex; width:53.318ex; height:7.509ex;" alt="{\displaystyle SE(\log(RR))={\sqrt {{\frac {IN}{IE(IE+IN)}}+{\frac {CN}{CE(CE+CN)}}}}.}"></span></dd></dl> <p>The <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle 1-\alpha }"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mn>1</mn> <mo>−</mo> <mi>α</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle 1-\alpha }</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/9afa7876fb8b4fb8c4d8039ebed6cd1cbc4781cd" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.505ex; width:5.49ex; height:2.343ex;" alt="{\displaystyle 1-\alpha }"></span> confidence interval for the <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \log(RR)}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>log</mi> <mo>⁡</mo> <mo stretchy="false">(</mo> <mi>R</mi> <mi>R</mi> <mo stretchy="false">)</mo> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \log(RR)}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/060c4ba35cdc4858ec503b7e6a92e85a63d1371d" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:8.309ex; height:2.843ex;" alt="{\displaystyle \log(RR)}"></span> is then </p> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle CI_{1-\alpha }(\log(RR))=\log(RR)\pm SE(\log(RR))\times z_{\alpha },}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>C</mi> <msub> <mi>I</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>1</mn> <mo>−</mo> <mi>α</mi> </mrow> </msub> <mo stretchy="false">(</mo> <mi>log</mi> <mo>⁡</mo> <mo stretchy="false">(</mo> <mi>R</mi> <mi>R</mi> <mo stretchy="false">)</mo> <mo stretchy="false">)</mo> <mo>=</mo> <mi>log</mi> <mo>⁡</mo> <mo stretchy="false">(</mo> <mi>R</mi> <mi>R</mi> <mo stretchy="false">)</mo> <mo>±</mo> <mi>S</mi> <mi>E</mi> <mo stretchy="false">(</mo> <mi>log</mi> <mo>⁡</mo> <mo stretchy="false">(</mo> <mi>R</mi> <mi>R</mi> <mo stretchy="false">)</mo> <mo stretchy="false">)</mo> <mo>×</mo> <msub> <mi>z</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>α</mi> </mrow> </msub> <mo>,</mo> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle CI_{1-\alpha }(\log(RR))=\log(RR)\pm SE(\log(RR))\times z_{\alpha },}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/f8e94ed3081268dd481a87890ff4a44f31635309" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:49.786ex; height:2.843ex;" alt="{\displaystyle CI_{1-\alpha }(\log(RR))=\log(RR)\pm SE(\log(RR))\times z_{\alpha },}"></span></dd></dl> <p>where <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle z_{\alpha }}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>z</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>α</mi> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle z_{\alpha }}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/d15af7d0b960b1fa79fe0480872050b4613a3ef6" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:2.365ex; height:2.009ex;" alt="{\displaystyle z_{\alpha }}"></span> is the <a href="/wiki/Standard_score" title="Standard score">standard score</a> for the chosen level of <a href="/wiki/Statistical_significance" title="Statistical significance">significance</a>.<sup id="cite_ref-:1_9-0" class="reference"><a href="#cite_note-:1-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> To find the confidence interval around the RR itself, the two bounds of the above confidence interval can be <a href="/wiki/Exponentiation" title="Exponentiation">exponentiated</a>.<sup id="cite_ref-:1_9-1" class="reference"><a href="#cite_note-:1-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> </p><p>In regression models, the exposure is typically included as an <a href="/wiki/Dummy_variable_(statistics)" title="Dummy variable (statistics)">indicator variable</a> along with other factors that may affect risk. The relative risk is usually reported as calculated for the <a href="/wiki/Mean" title="Mean">mean</a> of the sample values of the explanatory variables.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (May 2023)">citation needed</span></a></i>]</sup> </p> <div class="mw-heading mw-heading2"><h2 id="Comparison_to_the_odds_ratio">Comparison to the odds ratio</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Relative_risk&action=edit&section=4" title="Edit section: Comparison to the odds ratio"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Risk_Ratio_vs_Odds_Ratio.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/1/12/Risk_Ratio_vs_Odds_Ratio.svg/220px-Risk_Ratio_vs_Odds_Ratio.svg.png" decoding="async" width="220" height="179" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/12/Risk_Ratio_vs_Odds_Ratio.svg/330px-Risk_Ratio_vs_Odds_Ratio.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/12/Risk_Ratio_vs_Odds_Ratio.svg/440px-Risk_Ratio_vs_Odds_Ratio.svg.png 2x" data-file-width="300" data-file-height="244" /></a><figcaption>Risk ratio vs odds ratio</figcaption></figure> <p>The relative risk is different from the <a href="/wiki/Odds_ratio" title="Odds ratio">odds ratio</a>, although the odds ratio asymptotically approaches the relative risk for small probabilities of outcomes. If IE is substantially smaller than <i>IN</i>, then IE/(IE + IN) <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \scriptstyle \approx }"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mstyle displaystyle="false" scriptlevel="1"> <mo>≈</mo> </mstyle> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \scriptstyle \approx }</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/0606e4d70973e559c13bb22c432fced09f1df157" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: 0.089ex; margin-bottom: -0.26ex; width:1.279ex; height:1.176ex;" alt="{\displaystyle \scriptstyle \approx }"></span> IE/IN. Similarly, if CE is much smaller than CN, then CE/(CN + CE) <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \scriptstyle \approx }"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mstyle displaystyle="false" scriptlevel="1"> <mo>≈</mo> </mstyle> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \scriptstyle \approx }</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/0606e4d70973e559c13bb22c432fced09f1df157" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: 0.089ex; margin-bottom: -0.26ex; width:1.279ex; height:1.176ex;" alt="{\displaystyle \scriptstyle \approx }"></span> CE/CN. Thus, under <a href="/wiki/The_rare_disease_assumption" class="mw-redirect" title="The rare disease assumption">the rare disease assumption</a> </p> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle RR={\frac {IE(CE+CN)}{CE(IE+IN)}}\approx {\frac {IE\cdot CN}{IN\cdot CE}}=OR.}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>R</mi> <mi>R</mi> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mi>I</mi> <mi>E</mi> <mo stretchy="false">(</mo> <mi>C</mi> <mi>E</mi> <mo>+</mo> <mi>C</mi> <mi>N</mi> <mo stretchy="false">)</mo> </mrow> <mrow> <mi>C</mi> <mi>E</mi> <mo stretchy="false">(</mo> <mi>I</mi> <mi>E</mi> <mo>+</mo> <mi>I</mi> <mi>N</mi> <mo stretchy="false">)</mo> </mrow> </mfrac> </mrow> <mo>≈</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mi>I</mi> <mi>E</mi> <mo>⋅</mo> <mi>C</mi> <mi>N</mi> </mrow> <mrow> <mi>I</mi> <mi>N</mi> <mo>⋅</mo> <mi>C</mi> <mi>E</mi> </mrow> </mfrac> </mrow> <mo>=</mo> <mi>O</mi> <mi>R</mi> <mo>.</mo> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle RR={\frac {IE(CE+CN)}{CE(IE+IN)}}\approx {\frac {IE\cdot CN}{IN\cdot CE}}=OR.}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/47f5c926f863008d26210f926eb849aa229b932e" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.671ex; width:42.105ex; height:6.509ex;" alt="{\displaystyle RR={\frac {IE(CE+CN)}{CE(IE+IN)}}\approx {\frac {IE\cdot CN}{IN\cdot CE}}=OR.}"></span></dd></dl> <p>In practice the <a href="/wiki/Odds_ratio" title="Odds ratio">odds ratio</a> is commonly used for <a href="/wiki/Case-control_study" class="mw-redirect" title="Case-control study">case-control studies</a>, as the relative risk cannot be estimated.<sup id="cite_ref-pmid14695382_1-1" class="reference"><a href="#cite_note-pmid14695382-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p><p>In fact, the odds ratio has much more common use in statistics, since <a href="/wiki/Logistic_regression" title="Logistic regression">logistic regression</a>, often associated with <a href="/wiki/Clinical_trial" title="Clinical trial">clinical trials</a>, works with the log of the odds ratio, not relative risk. Because the (natural log of the) odds of a record is estimated as a linear function of the explanatory variables, the estimated odds ratio for 70-year-olds and 60-year-olds associated with the type of treatment would be the same in logistic regression models where the outcome is associated with drug and age, although the relative risk might be significantly different.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (August 2023)">citation needed</span></a></i>]</sup> </p><p>Since relative risk is a more intuitive measure of effectiveness, the distinction is important especially in cases of medium to high probabilities. If action A carries a risk of 99.9% and action B a risk of 99.0% then the relative risk is just over 1, while the odds associated with action A are more than 10 times higher than the odds with B.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (August 2023)">citation needed</span></a></i>]</sup> </p><p>In statistical modelling, approaches like <a href="/wiki/Poisson_regression" title="Poisson regression">Poisson regression</a> (for counts of events per unit exposure) have relative risk interpretations: the estimated effect of an explanatory variable is multiplicative on the rate and thus leads to a relative risk. <a href="/wiki/Logistic_regression" title="Logistic regression">Logistic regression</a> (for binary outcomes, or counts of successes out of a number of trials) must be interpreted in odds-ratio terms: the effect of an explanatory variable is multiplicative on the odds and thus leads to an odds ratio.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (August 2023)">citation needed</span></a></i>]</sup> </p> <div class="mw-heading mw-heading2"><h2 id="Bayesian_interpretation">Bayesian interpretation</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Relative_risk&action=edit&section=5" title="Edit section: Bayesian interpretation"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>We could assume a disease noted by <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle D}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>D</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle D}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/f34a0c600395e5d4345287e21fb26efd386990e6" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.924ex; height:2.176ex;" alt="{\displaystyle D}"></span>, and no disease noted by <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \neg D}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi mathvariant="normal">¬</mi> <mi>D</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \neg D}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/c85f1089e23dfa4d0d84ba7a2c794bcfe7f71598" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:3.475ex; height:2.176ex;" alt="{\displaystyle \neg D}"></span>, exposure noted by <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle E}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>E</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle E}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/4232c9de2ee3eec0a9c0a19b15ab92daa6223f9b" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.776ex; height:2.176ex;" alt="{\displaystyle E}"></span>, and no exposure noted by <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \neg E}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi mathvariant="normal">¬</mi> <mi>E</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \neg E}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/0d2771dd525bad1bb656104318ae9d6986459164" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:3.326ex; height:2.176ex;" alt="{\displaystyle \neg E}"></span>. The relative risk can be written as </p> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle RR={\frac {P(D\mid E)}{P(D\mid \neg E)}}={\frac {P(E\mid D)/P(\neg E\mid D)}{P(E)/P(\neg E)}}.}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>R</mi> <mi>R</mi> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mi>P</mi> <mo stretchy="false">(</mo> <mi>D</mi> <mo>∣</mo> <mi>E</mi> <mo stretchy="false">)</mo> </mrow> <mrow> <mi>P</mi> <mo stretchy="false">(</mo> <mi>D</mi> <mo>∣</mo> <mi mathvariant="normal">¬</mi> <mi>E</mi> <mo stretchy="false">)</mo> </mrow> </mfrac> </mrow> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mi>P</mi> <mo stretchy="false">(</mo> <mi>E</mi> <mo>∣</mo> <mi>D</mi> <mo stretchy="false">)</mo> <mrow class="MJX-TeXAtom-ORD"> <mo>/</mo> </mrow> <mi>P</mi> <mo stretchy="false">(</mo> <mi mathvariant="normal">¬</mi> <mi>E</mi> <mo>∣</mo> <mi>D</mi> <mo stretchy="false">)</mo> </mrow> <mrow> <mi>P</mi> <mo stretchy="false">(</mo> <mi>E</mi> <mo stretchy="false">)</mo> <mrow class="MJX-TeXAtom-ORD"> <mo>/</mo> </mrow> <mi>P</mi> <mo stretchy="false">(</mo> <mi mathvariant="normal">¬</mi> <mi>E</mi> <mo stretchy="false">)</mo> </mrow> </mfrac> </mrow> <mo>.</mo> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle RR={\frac {P(D\mid E)}{P(D\mid \neg E)}}={\frac {P(E\mid D)/P(\neg E\mid D)}{P(E)/P(\neg E)}}.}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/ebd62a60c193c7add4b1ef650bff8cbe0196f0b6" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.671ex; width:43.882ex; height:6.509ex;" alt="{\displaystyle RR={\frac {P(D\mid E)}{P(D\mid \neg E)}}={\frac {P(E\mid D)/P(\neg E\mid D)}{P(E)/P(\neg E)}}.}"></span></dd></dl> <p>This way the relative risk can be interpreted in Bayesian terms as the posterior ratio of the exposure (i.e. after seeing the disease) normalized by the prior ratio of exposure.<sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> If the posterior ratio of exposure is similar to that of the prior, the effect is approximately 1, indicating no association with the disease, since it didn't change beliefs of the exposure. If on the other hand, the posterior ratio of exposure is smaller or higher than that of the prior ratio, then the disease has changed the view of the exposure danger, and the magnitude of this change is the relative risk. </p> <div class="mw-heading mw-heading2"><h2 id="Numerical_example">Numerical example</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Relative_risk&action=edit&section=6" title="Edit section: Numerical example"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <table class="wikitable" style="border:none;"> <caption>Example of risk reduction </caption> <tbody><tr> <th>Quantity </th> <th>Experimental group (E) </th> <th><a href="/wiki/Scientific_control" title="Scientific control">Control group</a> (C) </th> <th>Total </th></tr> <tr> <th>Events (E) </th> <td><i>EE</i> = 15 </td> <td><i>CE</i> = 100 </td> <td>115 </td></tr> <tr> <th>Non-events (N) </th> <td><i>EN</i> = 135 </td> <td><i>CN</i> = 150 </td> <td>285 </td></tr> <tr> <th>Total subjects (S) </th> <td><i>ES</i> = <i>EE</i> + <i>EN</i> = 150 </td> <td><i>CS</i> = <i>CE</i> + <i>CN</i> = 250 </td> <td>400 </td></tr> <tr> <th>Event rate (ER) </th> <td><i><a href="/wiki/Experimental_event_rate" title="Experimental event rate">EER</a></i> = <i>EE</i> / <i>ES</i> = 0.1, or 10% </td> <td><i><a href="/wiki/Control_event_rate" class="mw-redirect" title="Control event rate">CER</a></i> = <i>CE</i> / <i>CS</i> = 0.4, or 40% </td> <td data-sort-value="" style="vertical-align:middle; text-align:center" class="table-na">— </td></tr></tbody></table> <table class="wikitable"> <tbody><tr> <th>Variable </th> <th><a href="/wiki/Abbreviation" title="Abbreviation">Abbr.</a> </th> <th>Formula </th> <th>Value </th></tr> <tr> <td><a href="/wiki/Absolute_risk_reduction" class="mw-redirect" title="Absolute risk reduction">Absolute risk reduction </a> </td> <td>ARR </td> <td><i>CER</i> − <i>EER</i> </td> <td>0.3, or 30% </td></tr> <tr> <td><a href="/wiki/Number_needed_to_treat" title="Number needed to treat">Number needed to treat</a> </td> <td>NNT </td> <td>1 / (<i>CER</i> − <i>EER</i>) </td> <td>3.33 </td></tr> <tr> <td><a class="mw-selflink selflink">Relative risk</a> (risk ratio) </td> <td>RR </td> <td><i>EER</i> / <i>CER</i> </td> <td>0.25 </td></tr> <tr> <td><a href="/wiki/Relative_risk_reduction" title="Relative risk reduction">Relative risk reduction</a> </td> <td>RRR </td> <td>(<i>CER</i> − <i>EER</i>) / <i>CER</i>, or 1 − <i>RR</i> </td> <td>0.75, or 75% </td></tr> <tr> <td><a href="/wiki/Preventable_fraction_among_the_unexposed" title="Preventable fraction among the unexposed">Preventable fraction among the unexposed</a> </td> <td>PF<small>u</small> </td> <td>(<i>CER</i> − <i>EER</i>) / <i>CER</i> </td> <td>0.75 </td></tr> <tr> <td><a href="/wiki/Odds_ratio" title="Odds ratio">Odds ratio</a> </td> <td>OR </td> <td>(<i>EE</i> / <i>EN</i>) / (<i>CE</i> / <i>CN</i>) </td> <td>0.167 </td></tr></tbody></table> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Relative_risk&action=edit&section=7" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1235681985">.mw-parser-output .side-box{margin:4px 0;box-sizing:border-box;border:1px solid #aaa;font-size:88%;line-height:1.25em;background-color:var(--background-color-interactive-subtle,#f8f9fa);display:flow-root}.mw-parser-output .side-box-abovebelow,.mw-parser-output .side-box-text{padding:0.25em 0.9em}.mw-parser-output .side-box-image{padding:2px 0 2px 0.9em;text-align:center}.mw-parser-output .side-box-imageright{padding:2px 0.9em 2px 0;text-align:center}@media(min-width:500px){.mw-parser-output .side-box-flex{display:flex;align-items:center}.mw-parser-output .side-box-text{flex:1;min-width:0}}@media(min-width:720px){.mw-parser-output .side-box{width:238px}.mw-parser-output .side-box-right{clear:right;float:right;margin-left:1em}.mw-parser-output .side-box-left{margin-right:1em}}</style><style data-mw-deduplicate="TemplateStyles:r1237033735">@media print{body.ns-0 .mw-parser-output .sistersitebox{display:none!important}}@media screen{html.skin-theme-clientpref-night .mw-parser-output .sistersitebox img[src*="Wiktionary-logo-en-v2.svg"]{background-color:white}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .sistersitebox img[src*="Wiktionary-logo-en-v2.svg"]{background-color:white}}</style><div class="side-box side-box-right plainlinks sistersitebox"><style data-mw-deduplicate="TemplateStyles:r1126788409">.mw-parser-output .plainlist ol,.mw-parser-output .plainlist ul{line-height:inherit;list-style:none;margin:0;padding:0}.mw-parser-output .plainlist ol li,.mw-parser-output .plainlist ul li{margin-bottom:0}</style> <div class="side-box-flex"> <div class="side-box-image"><span class="noviewer" typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/30px-Commons-logo.svg.png" decoding="async" width="30" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/45px-Commons-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/59px-Commons-logo.svg.png 2x" data-file-width="1024" data-file-height="1376" /></span></span></div> <div class="side-box-text plainlist">Wikimedia Commons has media related to <span style="font-weight: bold; font-style: italic;"><a href="https://commons.wikimedia.org/wiki/Category:Statistics_for_relative_risk" class="extiw" title="commons:Category:Statistics for relative risk">Statistics for relative risk</a></span>.</div></div> </div> <ul><li><a href="/wiki/Absolute_risk" title="Absolute risk">Absolute risk</a></li> <li><a href="/wiki/Relative_risk_reduction" title="Relative risk reduction">Relative risk reduction</a></li> <li><a href="/wiki/Base_rate_fallacy" title="Base rate fallacy">Base rate fallacy</a></li> <li><a href="/wiki/Cochran%E2%80%93Mantel%E2%80%93Haenszel_statistics" title="Cochran–Mantel–Haenszel statistics">Cochran–Mantel–Haenszel statistics</a> for aggregation of risk ratios across several strata</li> <li><a href="/wiki/Population_impact_measure" title="Population impact measure">Population impact measure</a></li> <li><a href="/wiki/OpenEpi" title="OpenEpi">OpenEpi</a></li> <li><a href="/wiki/Rate_ratio" title="Rate ratio">Rate ratio</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Relative_risk&action=edit&section=8" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap mw-references-columns"><ol class="references"> <li id="cite_note-pmid14695382-1"><span class="mw-cite-backlink">^ <a href="#cite_ref-pmid14695382_1-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-pmid14695382_1-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFSistromGarvan2004" class="citation journal cs1">Sistrom CL, Garvan CW (January 2004). "Proportions, odds, and risk". <i>Radiology</i>. <b>230</b> (1): 12–9. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1148%2Fradiol.2301031028">10.1148/radiol.2301031028</a>. <a href="/wiki/PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/14695382">14695382</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Radiology&rft.atitle=Proportions%2C+odds%2C+and+risk&rft.volume=230&rft.issue=1&rft.pages=12-9&rft.date=2004-01&rft_id=info%3Adoi%2F10.1148%2Fradiol.2301031028&rft_id=info%3Apmid%2F14695382&rft.aulast=Sistrom&rft.aufirst=CL&rft.au=Garvan%2C+CW&rfr_id=info%3Asid%2Fen.wikipedia.org%3ARelative+risk" class="Z3988"></span></span> </li> <li id="cite_note-:2-2"><span class="mw-cite-backlink">^ <a href="#cite_ref-:2_2-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-:2_2-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFCarneiro,_Ilona.2011" class="citation book cs1">Carneiro, Ilona. (2011). <a rel="nofollow" class="external text" href="https://www.worldcat.org/oclc/773348873"><i>Introduction to epidemiology</i></a>. Howard, Natasha. (2nd ed.). Maidenhead, Berkshire: Open University Press. p. 27. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-335-24462-1" title="Special:BookSources/978-0-335-24462-1"><bdi>978-0-335-24462-1</bdi></a>. <a href="/wiki/OCLC_(identifier)" class="mw-redirect" title="OCLC (identifier)">OCLC</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/oclc/773348873">773348873</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Introduction+to+epidemiology&rft.place=Maidenhead%2C+Berkshire&rft.pages=27&rft.edition=2nd&rft.pub=Open+University+Press&rft.date=2011&rft_id=info%3Aoclcnum%2F773348873&rft.isbn=978-0-335-24462-1&rft.au=Carneiro%2C+Ilona.&rft_id=https%3A%2F%2Fwww.worldcat.org%2Foclc%2F773348873&rfr_id=info%3Asid%2Fen.wikipedia.org%3ARelative+risk" class="Z3988"></span></span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFBruce,_Nigel,_1955-2017" class="citation book cs1">Bruce, Nigel, 1955- (29 November 2017). <a rel="nofollow" class="external text" href="https://www.worldcat.org/oclc/992438133"><i>Quantitative methods for health research : a practical interactive guide to epidemiology and statistics</i></a>. Pope, Daniel, 1969-, Stanistreet, Debbi, 1963- (Second ed.). Hoboken, NJ. p. 199. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-1-118-66526-8" title="Special:BookSources/978-1-118-66526-8"><bdi>978-1-118-66526-8</bdi></a>. <a href="/wiki/OCLC_(identifier)" class="mw-redirect" title="OCLC (identifier)">OCLC</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/oclc/992438133">992438133</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Quantitative+methods+for+health+research+%3A+a+practical+interactive+guide+to+epidemiology+and+statistics&rft.place=Hoboken%2C+NJ&rft.pages=199&rft.edition=Second&rft.date=2017-11-29&rft_id=info%3Aoclcnum%2F992438133&rft.isbn=978-1-118-66526-8&rft.au=Bruce%2C+Nigel%2C+1955-&rft_id=https%3A%2F%2Fwww.worldcat.org%2Foclc%2F992438133&rfr_id=info%3Asid%2Fen.wikipedia.org%3ARelative+risk" class="Z3988"></span><span class="cs1-maint citation-comment"><code class="cs1-code">{{<a href="/wiki/Template:Cite_book" title="Template:Cite book">cite book</a>}}</code>: CS1 maint: location missing publisher (<a href="/wiki/Category:CS1_maint:_location_missing_publisher" title="Category:CS1 maint: location missing publisher">link</a>) CS1 maint: multiple names: authors list (<a href="/wiki/Category:CS1_maint:_multiple_names:_authors_list" title="Category:CS1 maint: multiple names: authors list">link</a>) CS1 maint: numeric names: authors list (<a href="/wiki/Category:CS1_maint:_numeric_names:_authors_list" title="Category:CS1 maint: numeric names: authors list">link</a>)</span></span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFMotulsky,_Harvey2018" class="citation book cs1">Motulsky, Harvey (2018). <a rel="nofollow" class="external text" href="https://www.worldcat.org/oclc/1006531983"><i>Intuitive biostatistics : a nonmathematical guide to statistical thinking</i></a> (Fourth ed.). New York. p. 266. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-19-064356-0" title="Special:BookSources/978-0-19-064356-0"><bdi>978-0-19-064356-0</bdi></a>. <a href="/wiki/OCLC_(identifier)" class="mw-redirect" title="OCLC (identifier)">OCLC</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/oclc/1006531983">1006531983</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Intuitive+biostatistics+%3A+a+nonmathematical+guide+to+statistical+thinking&rft.place=New+York&rft.pages=266&rft.edition=Fourth&rft.date=2018&rft_id=info%3Aoclcnum%2F1006531983&rft.isbn=978-0-19-064356-0&rft.au=Motulsky%2C+Harvey&rft_id=https%3A%2F%2Fwww.worldcat.org%2Foclc%2F1006531983&rfr_id=info%3Asid%2Fen.wikipedia.org%3ARelative+risk" class="Z3988"></span><span class="cs1-maint citation-comment"><code class="cs1-code">{{<a href="/wiki/Template:Cite_book" title="Template:Cite book">cite book</a>}}</code>: CS1 maint: location missing publisher (<a href="/wiki/Category:CS1_maint:_location_missing_publisher" title="Category:CS1 maint: location missing publisher">link</a>)</span></span> </li> <li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFNakayamaZamanTanaka1998" class="citation journal cs1">Nakayama T, Zaman MM, Tanaka H (April 1998). "Reporting of attributable and relative risks, 1966-97". <i>Lancet</i>. <b>351</b> (9110): 1179. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1016%2Fs0140-6736%2805%2979123-6">10.1016/s0140-6736(05)79123-6</a>. <a href="/wiki/PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/9643696">9643696</a>. <a href="/wiki/S2CID_(identifier)" class="mw-redirect" title="S2CID (identifier)">S2CID</a> <a rel="nofollow" class="external text" href="https://api.semanticscholar.org/CorpusID:28195147">28195147</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Lancet&rft.atitle=Reporting+of+attributable+and+relative+risks%2C+1966-97&rft.volume=351&rft.issue=9110&rft.pages=1179&rft.date=1998-04&rft_id=https%3A%2F%2Fapi.semanticscholar.org%2FCorpusID%3A28195147%23id-name%3DS2CID&rft_id=info%3Apmid%2F9643696&rft_id=info%3Adoi%2F10.1016%2Fs0140-6736%2805%2979123-6&rft.aulast=Nakayama&rft.aufirst=T&rft.au=Zaman%2C+MM&rft.au=Tanaka%2C+H&rfr_id=info%3Asid%2Fen.wikipedia.org%3ARelative+risk" class="Z3988"></span></span> </li> <li id="cite_note-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-6">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFNoordzijvan_DiepenCaskeyJager2017" class="citation journal cs1">Noordzij M, van Diepen M, Caskey FC, Jager KJ (April 2017). <a rel="nofollow" class="external text" href="https://doi.org/10.1093%2Fndt%2Fgfw465">"Relative risk versus absolute risk: one cannot be interpreted without the other"</a>. <i>Nephrology, Dialysis, Transplantation</i>. <b>32</b> (suppl_2): ii13–ii18. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.1093%2Fndt%2Fgfw465">10.1093/ndt/gfw465</a></span>. <a href="/wiki/PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/28339913">28339913</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Nephrology%2C+Dialysis%2C+Transplantation&rft.atitle=Relative+risk+versus+absolute+risk%3A+one+cannot+be+interpreted+without+the+other&rft.volume=32&rft.issue=suppl_2&rft.pages=ii13-ii18&rft.date=2017-04&rft_id=info%3Adoi%2F10.1093%2Fndt%2Fgfw465&rft_id=info%3Apmid%2F28339913&rft.aulast=Noordzij&rft.aufirst=M&rft.au=van+Diepen%2C+M&rft.au=Caskey%2C+FC&rft.au=Jager%2C+KJ&rft_id=https%3A%2F%2Fdoi.org%2F10.1093%252Fndt%252Fgfw465&rfr_id=info%3Asid%2Fen.wikipedia.org%3ARelative+risk" class="Z3988"></span></span> </li> <li id="cite_note-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-7">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFMoherHopewellSchulzMontori2010" class="citation journal cs1">Moher D, Hopewell S, Schulz KF, Montori V, Gøtzsche PC, Devereaux PJ, Elbourne D, Egger M, Altman DG (March 2010). <a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2844943">"CONSORT 2010 explanation and elaboration: updated guidelines for reporting parallel group randomised trials"</a>. <i>BMJ</i>. <b>340</b>: c869. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1136%2Fbmj.c869">10.1136/bmj.c869</a>. <a href="/wiki/PMC_(identifier)" class="mw-redirect" title="PMC (identifier)">PMC</a> <span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2844943">2844943</a></span>. <a href="/wiki/PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/20332511">20332511</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=BMJ&rft.atitle=CONSORT+2010+explanation+and+elaboration%3A+updated+guidelines+for+reporting+parallel+group+randomised+trials&rft.volume=340&rft.pages=c869&rft.date=2010-03&rft_id=https%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fpmc%2Farticles%2FPMC2844943%23id-name%3DPMC&rft_id=info%3Apmid%2F20332511&rft_id=info%3Adoi%2F10.1136%2Fbmj.c869&rft.aulast=Moher&rft.aufirst=D&rft.au=Hopewell%2C+S&rft.au=Schulz%2C+KF&rft.au=Montori%2C+V&rft.au=G%C3%B8tzsche%2C+PC&rft.au=Devereaux%2C+PJ&rft.au=Elbourne%2C+D&rft.au=Egger%2C+M&rft.au=Altman%2C+DG&rft_id=https%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fpmc%2Farticles%2FPMC2844943&rfr_id=info%3Asid%2Fen.wikipedia.org%3ARelative+risk" class="Z3988"></span></span> </li> <li id="cite_note-8"><span class="mw-cite-backlink"><b><a href="#cite_ref-8">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.stata.com/support/faqs/stat/2deltameth.html">"Standard errors, confidence intervals, and significance tests"</a>. <i>StataCorp LLC</i>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=StataCorp+LLC&rft.atitle=Standard+errors%2C+confidence+intervals%2C+and+significance+tests&rft_id=https%3A%2F%2Fwww.stata.com%2Fsupport%2Ffaqs%2Fstat%2F2deltameth.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3ARelative+risk" class="Z3988"></span></span> </li> <li id="cite_note-:1-9"><span class="mw-cite-backlink">^ <a href="#cite_ref-:1_9-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-:1_9-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFSzkloNieto2019" class="citation book cs1">Szklo, Moyses; Nieto, F. Javier (2019). <i>Epidemiology : beyond the basics</i> (4th. ed.). Burlington, Massachusetts: Jones & Bartlett Learning. p. 488. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/9781284116595" title="Special:BookSources/9781284116595"><bdi>9781284116595</bdi></a>. <a href="/wiki/OCLC_(identifier)" class="mw-redirect" title="OCLC (identifier)">OCLC</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/oclc/1019839414">1019839414</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Epidemiology+%3A+beyond+the+basics&rft.place=Burlington%2C+Massachusetts&rft.pages=488&rft.edition=4th.&rft.pub=Jones+%26+Bartlett+Learning&rft.date=2019&rft_id=info%3Aoclcnum%2F1019839414&rft.isbn=9781284116595&rft.aulast=Szklo&rft.aufirst=Moyses&rft.au=Nieto%2C+F.+Javier&rfr_id=info%3Asid%2Fen.wikipedia.org%3ARelative+risk" class="Z3988"></span></span> </li> <li id="cite_note-10"><span class="mw-cite-backlink"><b><a href="#cite_ref-10">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFKatzBaptistaAzenPike1978" class="citation journal cs1">Katz, D.; Baptista, J.; Azen, S. P.; Pike, M. C. (1978). "Obtaining Confidence Intervals for the relative risk in Cohort Studies". <i>Biometrics</i>. <b>34</b> (3): 469–474. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.2307%2F2530610">10.2307/2530610</a>. <a href="/wiki/JSTOR_(identifier)" class="mw-redirect" title="JSTOR (identifier)">JSTOR</a> <a rel="nofollow" class="external text" href="https://www.jstor.org/stable/2530610">2530610</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Biometrics&rft.atitle=Obtaining+Confidence+Intervals+for+the+relative+risk+in+Cohort+Studies&rft.volume=34&rft.issue=3&rft.pages=469-474&rft.date=1978&rft_id=info%3Adoi%2F10.2307%2F2530610&rft_id=https%3A%2F%2Fwww.jstor.org%2Fstable%2F2530610%23id-name%3DJSTOR&rft.aulast=Katz&rft.aufirst=D.&rft.au=Baptista%2C+J.&rft.au=Azen%2C+S.+P.&rft.au=Pike%2C+M.+C.&rfr_id=info%3Asid%2Fen.wikipedia.org%3ARelative+risk" class="Z3988"></span></span> </li> <li id="cite_note-11"><span class="mw-cite-backlink"><b><a href="#cite_ref-11">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFArmitageBerryMatthews2002" class="citation book cs1"><a href="/wiki/Peter_Armitage_(statistician)" title="Peter Armitage (statistician)">Armitage P</a>, Berry G, Matthews JN (2002). Armitage P, Berry G, Matthews J (eds.). <i>Statistical Methods in Medical Research</i>. Vol. 64 (Fourth ed.). Blackwell Science Ltd. p. 1168. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1002%2F9780470773666">10.1002/9780470773666</a>. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-470-77366-6" title="Special:BookSources/978-0-470-77366-6"><bdi>978-0-470-77366-6</bdi></a>. <a href="/wiki/PMC_(identifier)" class="mw-redirect" title="PMC (identifier)">PMC</a> <span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1812060">1812060</a></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Statistical+Methods+in+Medical+Research&rft.pages=1168&rft.edition=Fourth&rft.pub=Blackwell+Science+Ltd&rft.date=2002&rft_id=https%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fpmc%2Farticles%2FPMC1812060%23id-name%3DPMC&rft_id=info%3Adoi%2F10.1002%2F9780470773666&rft.isbn=978-0-470-77366-6&rft.aulast=Armitage&rft.aufirst=P&rft.au=Berry%2C+G&rft.au=Matthews%2C+JN&rfr_id=info%3Asid%2Fen.wikipedia.org%3ARelative+risk" class="Z3988"></span> <span class="cs1-visible-error citation-comment"><code class="cs1-code">{{<a href="/wiki/Template:Cite_book" title="Template:Cite book">cite book</a>}}</code>: </span><span class="cs1-visible-error citation-comment"><code class="cs1-code">|journal=</code> ignored (<a href="/wiki/Help:CS1_errors#periodical_ignored" title="Help:CS1 errors">help</a>)</span></span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Relative_risk&action=edit&section=9" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a rel="nofollow" class="external text" href="http://www.medcalc.org/calc/relative_risk.php">Relative risk online calculator</a></li></ul> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist li{margin:0;display:inline}.mw-parser-output .hlist.inline,.mw-parser-output .hlist.inline dl,.mw-parser-output .hlist.inline ol,.mw-parser-output .hlist.inline ul,.mw-parser-output .hlist dl dl,.mw-parser-output .hlist dl ol,.mw-parser-output .hlist dl ul,.mw-parser-output .hlist ol dl,.mw-parser-output .hlist ol ol,.mw-parser-output .hlist ol ul,.mw-parser-output .hlist ul dl,.mw-parser-output .hlist ul ol,.mw-parser-output .hlist ul ul{display:inline}.mw-parser-output .hlist .mw-empty-li{display:none}.mw-parser-output .hlist dt::after{content:": "}.mw-parser-output .hlist dd::after,.mw-parser-output .hlist li::after{content:" · ";font-weight:bold}.mw-parser-output .hlist dd:last-child::after,.mw-parser-output .hlist dt:last-child::after,.mw-parser-output .hlist li:last-child::after{content:none}.mw-parser-output .hlist dd dd:first-child::before,.mw-parser-output .hlist dd dt:first-child::before,.mw-parser-output .hlist dd li:first-child::before,.mw-parser-output .hlist dt dd:first-child::before,.mw-parser-output .hlist dt dt:first-child::before,.mw-parser-output .hlist dt li:first-child::before,.mw-parser-output .hlist li dd:first-child::before,.mw-parser-output .hlist li dt:first-child::before,.mw-parser-output .hlist li li:first-child::before{content:" (";font-weight:normal}.mw-parser-output .hlist dd dd:last-child::after,.mw-parser-output .hlist dd dt:last-child::after,.mw-parser-output .hlist dd li:last-child::after,.mw-parser-output .hlist dt dd:last-child::after,.mw-parser-output .hlist dt dt:last-child::after,.mw-parser-output .hlist dt li:last-child::after,.mw-parser-output .hlist li dd:last-child::after,.mw-parser-output .hlist li dt:last-child::after,.mw-parser-output .hlist li li:last-child::after{content:")";font-weight:normal}.mw-parser-output .hlist ol{counter-reset:listitem}.mw-parser-output .hlist ol>li{counter-increment:listitem}.mw-parser-output .hlist ol>li::before{content:" "counter(listitem)"\a0 "}.mw-parser-output .hlist dd ol>li:first-child::before,.mw-parser-output .hlist dt ol>li:first-child::before,.mw-parser-output .hlist li ol>li:first-child::before{content:" ("counter(listitem)"\a0 "}</style><style data-mw-deduplicate="TemplateStyles:r1236075235">.mw-parser-output .navbox{box-sizing:border-box;border:1px solid #a2a9b1;width:100%;clear:both;font-size:88%;text-align:center;padding:1px;margin:1em auto 0}.mw-parser-output .navbox .navbox{margin-top:0}.mw-parser-output .navbox+.navbox,.mw-parser-output .navbox+.navbox-styles+.navbox{margin-top:-1px}.mw-parser-output .navbox-inner,.mw-parser-output .navbox-subgroup{width:100%}.mw-parser-output .navbox-group,.mw-parser-output .navbox-title,.mw-parser-output .navbox-abovebelow{padding:0.25em 1em;line-height:1.5em;text-align:center}.mw-parser-output .navbox-group{white-space:nowrap;text-align:right}.mw-parser-output .navbox,.mw-parser-output .navbox-subgroup{background-color:#fdfdfd}.mw-parser-output .navbox-list{line-height:1.5em;border-color:#fdfdfd}.mw-parser-output .navbox-list-with-group{text-align:left;border-left-width:2px;border-left-style:solid}.mw-parser-output tr+tr>.navbox-abovebelow,.mw-parser-output tr+tr>.navbox-group,.mw-parser-output tr+tr>.navbox-image,.mw-parser-output tr+tr>.navbox-list{border-top:2px solid #fdfdfd}.mw-parser-output .navbox-title{background-color:#ccf}.mw-parser-output .navbox-abovebelow,.mw-parser-output .navbox-group,.mw-parser-output .navbox-subgroup .navbox-title{background-color:#ddf}.mw-parser-output .navbox-subgroup .navbox-group,.mw-parser-output .navbox-subgroup .navbox-abovebelow{background-color:#e6e6ff}.mw-parser-output .navbox-even{background-color:#f7f7f7}.mw-parser-output .navbox-odd{background-color:transparent}.mw-parser-output .navbox .hlist td dl,.mw-parser-output .navbox .hlist td ol,.mw-parser-output .navbox .hlist td ul,.mw-parser-output .navbox td.hlist dl,.mw-parser-output .navbox td.hlist ol,.mw-parser-output .navbox td.hlist ul{padding:0.125em 0}.mw-parser-output .navbox .navbar{display:block;font-size:100%}.mw-parser-output .navbox-title .navbar{float:left;text-align:left;margin-right:0.5em}body.skin--responsive .mw-parser-output .navbox-image img{max-width:none!important}@media print{body.ns-0 .mw-parser-output .navbox{display:none!important}}</style></div><div role="navigation" class="navbox" aria-labelledby="Clinical_research_and_experimental_design" style="padding:3px"><table class="nowraplinks hlist mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><style data-mw-deduplicate="TemplateStyles:r1239400231">.mw-parser-output .navbar{display:inline;font-size:88%;font-weight:normal}.mw-parser-output .navbar-collapse{float:left;text-align:left}.mw-parser-output .navbar-boxtext{word-spacing:0}.mw-parser-output .navbar ul{display:inline-block;white-space:nowrap;line-height:inherit}.mw-parser-output .navbar-brackets::before{margin-right:-0.125em;content:"[ "}.mw-parser-output .navbar-brackets::after{margin-left:-0.125em;content:" ]"}.mw-parser-output .navbar li{word-spacing:-0.125em}.mw-parser-output .navbar a>span,.mw-parser-output .navbar a>abbr{text-decoration:inherit}.mw-parser-output .navbar-mini abbr{font-variant:small-caps;border-bottom:none;text-decoration:none;cursor:inherit}.mw-parser-output .navbar-ct-full{font-size:114%;margin:0 7em}.mw-parser-output .navbar-ct-mini{font-size:114%;margin:0 4em}html.skin-theme-clientpref-night .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}@media(prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}}@media print{.mw-parser-output .navbar{display:none!important}}</style><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Medical_research_studies" title="Template:Medical research studies"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Medical_research_studies" title="Template talk:Medical research studies"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Medical_research_studies" title="Special:EditPage/Template:Medical research studies"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Clinical_research_and_experimental_design" style="font-size:114%;margin:0 4em"><a href="/wiki/Clinical_research" title="Clinical research">Clinical research</a> and <a href="/wiki/Design_of_experiments" title="Design of experiments">experimental design</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">Overview</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Clinical_trial" title="Clinical trial">Clinical trial</a> <ul><li><a href="/wiki/Protocol_(science)" title="Protocol (science)">Trial protocols</a></li> <li><a href="/wiki/Adaptive_clinical_trial" class="mw-redirect" title="Adaptive clinical trial">Adaptive clinical trial</a></li></ul></li> <li><a href="/wiki/Academic_clinical_trials" class="mw-redirect" title="Academic clinical trials">Academic clinical trials</a></li> <li><a href="/wiki/Clinical_study_design" title="Clinical study design">Clinical study design</a></li> <li><a href="/wiki/Evidence-based_medicine" title="Evidence-based medicine">Evidence-based medicine</a></li> <li><a href="/wiki/Real_world_evidence" title="Real world evidence">Real world evidence</a></li> <li><a href="/wiki/Patient_and_public_involvement" title="Patient and public involvement">Patient and public involvement</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Scientific_control" title="Scientific control">Controlled study</a><br />(<a href="/wiki/Hierarchy_of_evidence#USA" title="Hierarchy of evidence">EBM I to II-1</a>)</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Randomized_controlled_trial" title="Randomized controlled trial">Randomized controlled trial</a> <ul><li><a href="/wiki/Experiment" title="Experiment">Scientific experiment</a></li> <li><a href="/wiki/Blind_experiment" class="mw-redirect" title="Blind experiment">Blind experiment</a></li> <li><a href="/wiki/Open-label_trial" title="Open-label trial">Open-label trial</a></li></ul></li> <li><a href="/wiki/Adaptive_clinical_trial" class="mw-redirect" title="Adaptive clinical trial">Adaptive clinical trial</a> <ul><li><a href="/wiki/Platform_trial" title="Platform trial">Platform trial</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Observational_study" title="Observational study">Observational study</a><br />(<a href="/wiki/Hierarchy_of_evidence#USA" title="Hierarchy of evidence">EBM II-2 to II-3</a>)</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Cross-sectional_study" title="Cross-sectional study">Cross-sectional study</a> vs. <a href="/wiki/Longitudinal_study" title="Longitudinal study">Longitudinal study</a>, <a href="/wiki/Ecological_study" title="Ecological study">Ecological study</a></li> <li><a href="/wiki/Cohort_study" title="Cohort study">Cohort study</a> <ul><li><a href="/wiki/Retrospective_cohort_study" title="Retrospective cohort study">Retrospective</a></li> <li><a href="/wiki/Prospective_cohort_study" title="Prospective cohort study">Prospective</a></li></ul></li> <li><a href="/wiki/Case%E2%80%93control_study" title="Case–control study">Case–control study</a> (<a href="/wiki/Nested_case%E2%80%93control_study" title="Nested case–control study">Nested case–control study</a>)</li> <li><a href="/wiki/Case_series" title="Case series">Case series</a></li> <li><a href="/wiki/Case_study" title="Case study">Case study</a></li> <li><a href="/wiki/Case_report" title="Case report">Case report</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Outcome_measure" title="Outcome measure">Measures</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Epidemiological_methods#Measures_of_occurrence" class="mw-redirect" title="Epidemiological methods">Occurrence</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"><a href="/wiki/Incidence_(epidemiology)" title="Incidence (epidemiology)">Incidence</a>, <a href="/wiki/Cumulative_incidence" class="mw-redirect" title="Cumulative incidence">Cumulative incidence</a>, <a href="/wiki/Prevalence" title="Prevalence">Prevalence</a>, <a href="/wiki/Point_prevalence" class="mw-redirect" title="Point prevalence">Point prevalence</a>, <a href="/wiki/Period_prevalence" class="mw-redirect" title="Period prevalence">Period prevalence</a></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Epidemiological_methods#Measures_of_association" class="mw-redirect" title="Epidemiological methods">Association</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"><a href="/wiki/Risk_difference" title="Risk difference">Risk difference</a>, <a href="/wiki/Number_needed_to_treat" title="Number needed to treat">Number needed to treat</a>, <a href="/wiki/Number_needed_to_harm" title="Number needed to harm">Number needed to harm</a>, <a href="/wiki/Risk_ratio" class="mw-redirect" title="Risk ratio">Risk ratio</a>, <a href="/wiki/Relative_risk_reduction" title="Relative risk reduction">Relative risk reduction</a>, <a href="/wiki/Odds_ratio" title="Odds ratio">Odds ratio</a>, <a href="/wiki/Hazard_ratio" title="Hazard ratio">Hazard ratio</a></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Population_impact_measure" title="Population impact measure">Population impact</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"><a href="/wiki/Attributable_fraction_among_the_exposed" title="Attributable fraction among the exposed">Attributable fraction among the exposed</a>, <a href="/wiki/Attributable_fraction_for_the_population" title="Attributable fraction for the population">Attributable fraction for the population</a>, <a href="/wiki/Preventable_fraction_among_the_unexposed" title="Preventable fraction among the unexposed">Preventable fraction among the unexposed</a>, <a href="/wiki/Preventable_fraction_for_the_population" title="Preventable fraction for the population">Preventable fraction for the population</a></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Epidemiological_methods#Other_measures" class="mw-redirect" title="Epidemiological methods">Other</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"><a href="/wiki/Clinical_endpoint" title="Clinical endpoint">Clinical endpoint</a>, <a href="/wiki/Virulence" title="Virulence">Virulence</a>, <a href="/wiki/Infectivity" title="Infectivity">Infectivity</a>, <a href="/wiki/Mortality_rate" title="Mortality rate">Mortality rate</a>, <a href="/wiki/Morbidity" class="mw-redirect" title="Morbidity">Morbidity</a>, <a href="/wiki/Case_fatality_rate" title="Case fatality rate">Case fatality rate</a>, <a href="/wiki/Specificity_and_sensitivity" class="mw-redirect" title="Specificity and sensitivity">Specificity and sensitivity</a>, <a href="/wiki/Likelihood_ratios_in_diagnostic_testing" title="Likelihood ratios in diagnostic testing">Likelihood-ratios</a>, <a href="/wiki/Pre-_and_post-test_probability" title="Pre- and post-test probability">Pre- and post-test probability</a></div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Trial/test types</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/In_vitro" title="In vitro">In vitro</a></li> <li><a href="/wiki/In_vivo" title="In vivo">In vivo</a></li> <li><a href="/wiki/Animal_testing" title="Animal testing">Animal testing</a></li> <li><a href="/wiki/Animal_testing_on_non-human_primates" title="Animal testing on non-human primates">Animal testing on non-human primates</a></li> <li><a href="/wiki/First-in-man_study" class="mw-redirect" title="First-in-man study">First-in-man study</a></li> <li><a href="/wiki/Multicenter_trial" title="Multicenter trial">Multicenter trial</a></li> <li><a href="/wiki/Seeding_trial" title="Seeding trial">Seeding trial</a></li> <li><a href="/wiki/Vaccine_trial" title="Vaccine trial">Vaccine trial</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Analysis_of_clinical_trials" title="Analysis of clinical trials">Analysis of clinical trials</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Risk%E2%80%93benefit_ratio" title="Risk–benefit ratio">Risk–benefit ratio</a></li> <li><a href="/wiki/Systematic_review" title="Systematic review">Systematic review</a></li> <li><a href="/wiki/Reproducibility" title="Reproducibility">Replication</a></li> <li><a href="/wiki/Meta-analysis" title="Meta-analysis">Meta-analysis</a></li> <li><a href="/wiki/Intention-to-treat_analysis" title="Intention-to-treat analysis">Intention-to-treat analysis</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Interpretation of results</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Selection_bias" title="Selection bias">Selection bias</a></li> <li><a href="/wiki/Survivorship_bias" title="Survivorship bias">Survivorship bias</a></li> <li><a href="/wiki/Correlation_does_not_imply_causation" title="Correlation does not imply causation">Correlation does not imply causation</a></li> <li><a href="/wiki/Null_result" title="Null result">Null result</a></li> <li><a href="/wiki/Sex_as_a_biological_variable" title="Sex as a biological variable">Sex as a biological variable</a></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div> <ul><li><b><a href="/wiki/Category:Clinical_research" title="Category:Clinical research">Category</a></b></li> <li><b><a href="/wiki/Glossary_of_clinical_research" title="Glossary of clinical research">Glossary</a></b></li> <li><b><a href="/wiki/List_of_clinical_research_topics" class="mw-redirect" title="List of clinical research topics">List of topics</a></b></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox" aria-labelledby="Public_health" style="padding:3px"><table class="nowraplinks hlist mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Public_health" title="Template:Public health"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Public_health" title="Template talk:Public health"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Public_health" title="Special:EditPage/Template:Public health"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Public_health" style="font-size:114%;margin:0 4em"><a href="/wiki/Public_health" title="Public health">Public health</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">General</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Auxology" title="Auxology">Auxology</a></li> <li><a href="/wiki/Biological_hazard" title="Biological hazard">Biological hazard</a></li> <li><a href="/wiki/Chief_Medical_Officer" class="mw-redirect" title="Chief Medical Officer">Chief Medical Officer</a></li> <li><a href="/wiki/Cultural_competence_in_health_care" class="mw-redirect" title="Cultural competence in health care">Cultural competence</a></li> <li><a href="/wiki/Deviance_(sociology)" title="Deviance (sociology)">Deviance</a></li> <li><a href="/wiki/Environmental_health" title="Environmental health">Environmental health</a></li> <li><a href="/wiki/Eugenics" title="Eugenics">Eugenics</a> <ul><li><a href="/wiki/History_of_eugenics" title="History of eugenics">History of</a></li> <li><a href="/wiki/New_eugenics" title="New eugenics">Liberal</a></li></ul></li> <li><a href="/wiki/Euthenics" title="Euthenics">Euthenics</a></li> <li><a href="/wiki/Public_health_genomics" title="Public health genomics">Genomics</a></li> <li><a href="/wiki/Globalization_and_disease" title="Globalization and disease">Globalization and disease</a></li> <li><a href="/wiki/Harm_reduction" title="Harm reduction">Harm reduction</a></li> <li><a href="/wiki/Health_economics" title="Health economics">Health economics</a></li> <li><a href="/wiki/Health_literacy" title="Health literacy">Health literacy</a></li> <li><a href="/wiki/Health_policy" title="Health policy">Health policy</a> <ul><li><a href="/wiki/Health_system" title="Health system">Health system</a></li> <li><a href="/wiki/Health_care_reform" title="Health care reform">Health care reform</a></li></ul></li> <li><a href="/wiki/Housing_First" title="Housing First">Housing First</a></li> <li><a href="/wiki/Human_right_to_water_and_sanitation" title="Human right to water and sanitation">Human right to water and sanitation</a></li> <li><a href="/wiki/Management_of_depression" title="Management of depression">Management of depression</a> <ul><li><a href="/wiki/Public_health_law" title="Public health law">Public health law</a></li> <li><a href="/wiki/National_public_health_institutes" class="mw-redirect" title="National public health institutes">National public health institute</a></li></ul></li> <li><a href="/wiki/Health_politics" title="Health politics">Health politics</a></li> <li><a href="/wiki/Labor_rights" title="Labor rights">Labor rights</a></li> <li><a href="/wiki/Maternal_health" title="Maternal health">Maternal health</a></li> <li><a href="/wiki/Medical_anthropology" title="Medical anthropology">Medical anthropology</a></li> <li><a href="/wiki/Medical_sociology" title="Medical sociology">Medical sociology</a></li> <li><a href="/wiki/Mental_health" title="Mental health">Mental health</a> (<a href="/wiki/Minister_of_Mental_Health" title="Minister of Mental Health">Ministers</a>)</li> <li><a href="/wiki/Occupational_safety_and_health" title="Occupational safety and health">Occupational safety and health</a></li> <li><a href="/wiki/Pharmaceutical_policy" title="Pharmaceutical policy">Pharmaceutical policy</a></li> <li><a href="/wiki/Pollution" title="Pollution">Pollution</a> <ul><li><a href="/wiki/Air_pollution" title="Air pollution">Air</a></li> <li><a href="/wiki/Water_pollution" title="Water pollution">Water</a></li> <li><a href="/wiki/Soil_pollution" class="mw-redirect" title="Soil pollution">Soil</a></li> <li><a href="/wiki/Radioactive_contamination" title="Radioactive contamination">Radiation</a></li> <li><a href="/wiki/Light_pollution" title="Light pollution">Light</a></li></ul></li> <li><a href="/wiki/Prisoners%27_rights" title="Prisoners' rights">Prisoners' rights</a></li> <li><a href="/wiki/Public_health_intervention" title="Public health intervention">Public health intervention</a></li> <li><a href="/wiki/Public_health_laboratory" title="Public health laboratory">Public health laboratory</a></li> <li><a href="/wiki/Right_to_food" title="Right to food">Right to food</a></li> <li><a href="/wiki/Right_to_health" title="Right to health">Right to health</a></li> <li><a href="/wiki/Right_to_housing" title="Right to housing">Right to housing</a></li> <li><a href="/wiki/Right_to_rest_and_leisure" title="Right to rest and leisure">Right to rest and leisure</a></li> <li><a href="/wiki/Right_to_sit" title="Right to sit">Right to sit</a></li> <li><a href="/wiki/Security_of_person" title="Security of person">Security of person</a></li> <li><a href="/wiki/Sexual_and_reproductive_health" title="Sexual and reproductive health">Sexual and reproductive health</a></li> <li><a href="/wiki/Social_psychology" title="Social psychology">Social psychology</a></li> <li><a href="/wiki/Sociology_of_health_and_illness" title="Sociology of health and illness">Sociology of health and illness</a></li> <li><a href="/wiki/Unisex_changing_rooms" title="Unisex changing rooms">Unisex changing rooms</a></li> <li><a href="/wiki/Unisex_public_toilets" class="mw-redirect" title="Unisex public toilets">Unisex public toilets</a></li> <li><a href="/wiki/Workers%27_right_to_access_the_toilet" title="Workers' right to access the toilet">Workers' right to access the toilet</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Preventive_healthcare" title="Preventive healthcare">Preventive healthcare</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Behavior_change_(public_health)" title="Behavior change (public health)">Behavior change</a> <ul><li><a href="/wiki/Behavioural_change_theories" title="Behavioural change theories">Theories</a></li></ul></li> <li><a href="/wiki/Family_planning" title="Family planning">Family planning</a></li> <li><a href="/wiki/Health_promotion" title="Health promotion">Health promotion</a></li> <li><a href="/wiki/Human_nutrition" title="Human nutrition">Human nutrition</a> <ul><li><a href="/wiki/Healthy_diet" title="Healthy diet">Healthy diet</a></li> <li><a href="/wiki/Preventive_nutrition" title="Preventive nutrition">Preventive nutrition</a></li></ul></li> <li><a href="/wiki/Hygiene" title="Hygiene">Hygiene</a> <ul><li><a href="/wiki/Food_safety" title="Food safety">Food safety</a></li> <li><a href="/wiki/Hand_washing" title="Hand washing">Hand washing</a></li> <li><a href="/wiki/Infection_control" class="mw-redirect" title="Infection control">Infection control</a></li> <li><a href="/wiki/Oral_hygiene" title="Oral hygiene">Oral hygiene</a></li></ul></li> <li><a href="/wiki/Occupational_safety_and_health" title="Occupational safety and health">Occupational safety and health</a> <ul><li><a href="/wiki/Human_factors_and_ergonomics" class="mw-redirect" title="Human factors and ergonomics">Human factors and ergonomics</a></li> <li><a href="/wiki/Occupational_hygiene" title="Occupational hygiene">Hygiene</a></li> <li><a href="/wiki/Drug_policy" title="Drug policy">Controlled Drugs</a></li> <li><a href="/wiki/Injury_prevention" title="Injury prevention">Injury prevention</a></li> <li><a href="/wiki/Occupational_medicine" title="Occupational medicine">Medicine</a></li> <li><a href="/wiki/Occupational_health_nursing" title="Occupational health nursing">Nursing</a></li></ul></li> <li><a href="/wiki/Patient_safety" title="Patient safety">Patient safety</a> <ul><li><a href="/wiki/Patient_safety_organization" title="Patient safety organization">Organization</a></li></ul></li> <li><a href="/wiki/Pharmacovigilance" title="Pharmacovigilance">Pharmacovigilance</a></li> <li><a href="/wiki/Safe_sex" title="Safe sex">Safe sex</a></li> <li><a href="/wiki/Sanitation" title="Sanitation">Sanitation</a> <ul><li><a href="/wiki/Emergency_sanitation" title="Emergency sanitation">Emergency</a></li> <li><a href="/wiki/Fecal%E2%80%93oral_route" title="Fecal–oral route">Fecal–oral transmission</a></li> <li><a href="/wiki/Open_defecation" title="Open defecation">Open defecation</a></li> <li><a href="/wiki/Sanitary_sewer" title="Sanitary sewer">Sanitary sewer</a></li> <li><a href="/wiki/Waterborne_diseases" class="mw-redirect" title="Waterborne diseases">Waterborne diseases</a></li> <li><a href="/wiki/Sanitation_worker" title="Sanitation worker">Worker</a></li></ul></li> <li><a href="/wiki/School_hygiene" title="School hygiene">School hygiene</a></li> <li><a href="/wiki/Smoking_cessation" title="Smoking cessation">Smoking cessation</a></li> <li><a href="/wiki/Vaccination" title="Vaccination">Vaccination</a></li> <li><a href="/wiki/Vector_control" title="Vector control">Vector control</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Population_health" title="Population health">Population health</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Biostatistics" title="Biostatistics">Biostatistics</a></li> <li><a href="/wiki/Child_mortality" title="Child mortality">Child mortality</a></li> <li><a href="/wiki/Community_health" title="Community health">Community health</a></li> <li><a href="/wiki/Epidemiology" title="Epidemiology">Epidemiology</a></li> <li><a href="/wiki/Global_health" title="Global health">Global health</a></li> <li><a href="/wiki/Health_impact_assessment" title="Health impact assessment">Health impact assessment</a></li> <li><a href="/wiki/Health_system" title="Health system">Health system</a></li> <li><a href="/wiki/Infant_mortality" title="Infant mortality">Infant mortality</a></li> <li><a href="/wiki/List_of_open-source_health_software" title="List of open-source health software">Open-source healthcare software</a></li> <li><a href="/wiki/Multimorbidity" title="Multimorbidity">Multimorbidity</a></li> <li><a href="/wiki/Public_health_informatics" title="Public health informatics">Public health informatics</a></li> <li><a href="/wiki/Social_determinants_of_health" title="Social determinants of health">Social determinants of health</a> <ul><li><a href="/wiki/Commercial_determinants_of_health" title="Commercial determinants of health">Commercial determinants of health</a></li> <li><a href="/wiki/Health_equity" title="Health equity">Health equity</a></li> <li><a href="/wiki/Race_and_health" title="Race and health">Race and health</a></li></ul></li> <li><a href="/wiki/Social_medicine" title="Social medicine">Social medicine</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Biological and<br />epidemiological statistics</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Case%E2%80%93control_study" title="Case–control study">Case–control study</a></li> <li><a href="/wiki/Randomized_controlled_trial" title="Randomized controlled trial">Randomized controlled trial</a></li> <li><a class="mw-selflink selflink">Relative risk</a></li> <li><a href="/wiki/Statistical_hypothesis_testing" class="mw-redirect" title="Statistical hypothesis testing">Statistical hypothesis testing</a> <ul><li><a href="/wiki/Analysis_of_variance" title="Analysis of variance">Analysis of variance (ANOVA)</a></li> <li><a href="/wiki/Regression_analysis" title="Regression analysis">Regression analysis</a></li> <li><a href="/wiki/ROC_curve" class="mw-redirect" title="ROC curve">ROC curve</a></li> <li><a href="/wiki/Student%27s_t-test" title="Student's t-test">Student's <i>t</i>-test</a></li> <li><a href="/wiki/Z-test" title="Z-test"><i>Z</i>-test</a></li></ul></li> <li><a href="/wiki/List_of_statistical_packages" class="mw-redirect" title="List of statistical packages">Statistical software</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Infectious and epidemic<br />disease prevention</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Asymptomatic_carrier" title="Asymptomatic carrier">Asymptomatic carrier</a></li> <li><a href="/wiki/Epidemic" title="Epidemic">Epidemics</a> <ul><li><a href="/wiki/List_of_epidemics_and_pandemics" title="List of epidemics and pandemics">List</a></li></ul></li> <li><a href="/wiki/Notifiable_disease" title="Notifiable disease">Notifiable diseases</a> <ul><li><a href="/wiki/List_of_notifiable_diseases" title="List of notifiable diseases">List</a></li></ul></li> <li><a href="/wiki/Public_health_surveillance" title="Public health surveillance">Public health surveillance</a> <ul><li><a href="/wiki/Disease_surveillance" title="Disease surveillance">Disease surveillance</a></li></ul></li> <li><a href="/wiki/Quarantine" title="Quarantine">Quarantine</a></li> <li><a href="/wiki/Sexually_transmitted_infection" title="Sexually transmitted infection">Sexually transmitted infection</a></li> <li><a href="/wiki/Social_distancing" title="Social distancing">Social distancing</a></li> <li><a href="/wiki/Tropical_disease" title="Tropical disease">Tropical disease</a></li> <li><a href="/wiki/Vaccine_trial" title="Vaccine trial">Vaccine trial</a></li> <li><a href="/wiki/WASH" title="WASH">WASH</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Food hygiene and<br />safety management</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li>Food <ul><li><a href="/wiki/Food_additive" title="Food additive">Additive</a></li> <li><a href="/wiki/Food_chemistry" title="Food chemistry">Chemistry</a></li> <li><a href="/wiki/Food_engineering" title="Food engineering">Engineering</a></li> <li><a href="/wiki/Food_microbiology" title="Food microbiology">Microbiology</a></li> <li><a href="/wiki/Food_processing" title="Food processing">Processing</a></li> <li><a href="/wiki/Food_safety" title="Food safety">Safety</a></li> <li><a href="/wiki/Category:Food_safety_scandals" title="Category:Food safety scandals">Safety scandals</a></li></ul></li> <li><a href="/wiki/Good_agricultural_practice" title="Good agricultural practice">Good agricultural practice</a></li> <li><a href="/wiki/Good_manufacturing_practice" title="Good manufacturing practice">Good manufacturing practice</a> <ul><li><a href="/wiki/HACCP" class="mw-redirect" title="HACCP">HACCP</a></li> <li><a href="/wiki/ISO_22000" title="ISO 22000">ISO 22000</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Health behavioral<br />sciences</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Diffusion_of_innovations" title="Diffusion of innovations">Diffusion of innovations</a></li> <li><a href="/wiki/Health_belief_model" title="Health belief model">Health belief model</a></li> <li><a href="/wiki/Health_communication" title="Health communication">Health communication</a></li> <li><a href="/wiki/Health_psychology" title="Health psychology">Health psychology</a></li> <li><a href="/wiki/Positive_deviance" title="Positive deviance">Positive deviance</a></li> <li><a href="/wiki/PRECEDE%E2%80%93PROCEED_model" title="PRECEDE–PROCEED model">PRECEDE–PROCEED model</a></li> <li><a href="/wiki/Social_cognitive_theory" title="Social cognitive theory">Social cognitive theory</a></li> <li><a href="/wiki/Social_norms_approach" title="Social norms approach">Social norms approach</a></li> <li><a href="/wiki/Theory_of_planned_behavior" title="Theory of planned behavior">Theory of planned behavior</a></li> <li><a href="/wiki/Transtheoretical_model" title="Transtheoretical model">Transtheoretical model</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Organizations,<br />education<br />and history</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Organizations</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li>Caribbean <ul><li><a href="/wiki/Caribbean_Public_Health_Agency" title="Caribbean Public Health Agency">Caribbean Public Health Agency</a></li></ul></li> <li>China <ul><li><a href="/wiki/Chinese_Center_for_Disease_Control_and_Prevention" title="Chinese Center for Disease Control and Prevention">Center for Disease Control and Prevention</a></li></ul></li> <li>Europe <ul><li><a href="/wiki/European_Centre_for_Disease_Prevention_and_Control" title="European Centre for Disease Prevention and Control">Centre for Disease Prevention and Control</a></li> <li><a href="/wiki/European_Parliament_Committee_on_the_Environment,_Public_Health_and_Food_Safety" title="European Parliament Committee on the Environment, Public Health and Food Safety">Committee on the Environment, Public Health and Food Safety</a></li></ul></li> <li>India <ul><li><a href="/wiki/Ministry_of_Health_and_Family_Welfare" title="Ministry of Health and Family Welfare">Ministry of Health and Family Welfare</a></li></ul></li> <li>Canada <ul><li><a href="/wiki/Health_Canada" title="Health Canada">Health Canada</a></li> <li><a href="/wiki/Public_Health_Agency_of_Canada" title="Public Health Agency of Canada">Public Health Agency</a></li></ul></li> <li>U.S. <ul><li><a href="/wiki/Centers_for_Disease_Control_and_Prevention" title="Centers for Disease Control and Prevention">Centers for Disease Control and Prevention</a></li> <li><a href="/wiki/Health_departments_in_the_United_States" title="Health departments in the United States">Health departments in the United States</a></li> <li><a href="/wiki/Council_on_Education_for_Public_Health" title="Council on Education for Public Health">Council on Education for Public Health</a></li> <li><a href="/wiki/United_States_Public_Health_Service" title="United States Public Health Service">Public Health Service</a></li></ul></li> <li><a href="/wiki/World_Health_Organization" title="World Health Organization">World Health Organization</a></li> <li><a href="/wiki/World_Toilet_Organization" title="World Toilet Organization">World Toilet Organization</a></li> <li>(<a href="/wiki/List_of_national_public_health_agencies" title="List of national public health agencies">Full list</a>)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Education</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Health_education" title="Health education">Health education</a></li> <li>Higher education <ul><li><a href="/wiki/Bachelor_of_Science_in_Public_Health" title="Bachelor of Science in Public Health">Bachelor of Science in Public Health</a></li> <li><a href="/wiki/Doctor_of_Public_Health" title="Doctor of Public Health">Doctor of Public Health</a></li> <li><a href="/wiki/Professional_degrees_of_public_health" title="Professional degrees of public health">Professional degrees of public health</a></li> <li><a href="/wiki/Category:Schools_of_public_health" title="Category:Schools of public health">Schools of public health</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">History</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Sara_Josephine_Baker" title="Sara Josephine Baker">Sara Josephine Baker</a></li> <li><a href="/wiki/Samuel_Jay_Crumbine" title="Samuel Jay Crumbine">Samuel Jay Crumbine</a></li> <li><a href="/wiki/Carl_Rogers_Darnall" title="Carl Rogers Darnall">Carl Rogers Darnall</a></li> <li><a href="/wiki/Joseph_Lister" title="Joseph Lister">Joseph Lister</a></li> <li><a href="/wiki/Margaret_Sanger" title="Margaret Sanger">Margaret Sanger</a></li> <li><a href="/wiki/John_Snow_(physician)" class="mw-redirect" title="John Snow (physician)">John Snow</a></li> <li><a href="/wiki/Mary_Mallon" title="Mary Mallon">Typhoid Mary</a></li> <li><a href="/wiki/Radium_Girls" title="Radium Girls">Radium Girls</a></li> <li><a href="/wiki/Germ_theory_of_disease" title="Germ theory of disease">Germ theory of disease</a></li> <li><a href="/wiki/Social_hygiene_movement" title="Social hygiene movement">Social hygiene movement</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div> <ul><li><span class="noviewer" typeof="mw:File"><span title="Category"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/16px-Symbol_category_class.svg.png" decoding="async" width="16" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/23px-Symbol_category_class.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/31px-Symbol_category_class.svg.png 2x" data-file-width="180" data-file-height="185" /></span></span> <b><a href="/wiki/Category:Public_health" title="Category:Public health">Category</a></b></li> <li><span class="noviewer" typeof="mw:File"><span title="Commons page"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/12px-Commons-logo.svg.png" decoding="async" width="12" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/18px-Commons-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/24px-Commons-logo.svg.png 2x" data-file-width="1024" data-file-height="1376" /></span></span> <b><a href="https://commons.wikimedia.org/wiki/Category:Public_health" class="extiw" title="commons:Category:Public health">Commons</a></b></li> <li><span class="noviewer" typeof="mw:File"><span title="WikiProject"><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/37/People_icon.svg/16px-People_icon.svg.png" decoding="async" width="16" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/37/People_icon.svg/24px-People_icon.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/37/People_icon.svg/32px-People_icon.svg.png 2x" data-file-width="100" data-file-height="100" /></span></span> <b><a href="/wiki/Wikipedia:WikiProject_Nursing" title="Wikipedia:WikiProject Nursing">WikiProject</a></b></li></ul> </div></td></tr></tbody></table></div>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://en.wikipedia.org/w/index.php?title=Relative_risk&oldid=1249344067">https://en.wikipedia.org/w/index.php?title=Relative_risk&oldid=1249344067</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Help:Category" title="Help:Category">Categories</a>: <ul><li><a href="/wiki/Category:Epidemiology" title="Category:Epidemiology">Epidemiology</a></li><li><a href="/wiki/Category:Biostatistics" title="Category:Biostatistics">Biostatistics</a></li><li><a href="/wiki/Category:Medical_statistics" title="Category:Medical statistics">Medical statistics</a></li><li><a href="/wiki/Category:Statistical_ratios" title="Category:Statistical ratios">Statistical ratios</a></li></ul></div><div id="mw-hidden-catlinks" class="mw-hidden-catlinks mw-hidden-cats-hidden">Hidden categories: <ul><li><a href="/wiki/Category:CS1_maint:_location_missing_publisher" title="Category:CS1 maint: location missing publisher">CS1 maint: location missing publisher</a></li><li><a href="/wiki/Category:CS1_maint:_multiple_names:_authors_list" title="Category:CS1 maint: multiple names: authors list">CS1 maint: multiple names: authors list</a></li><li><a href="/wiki/Category:CS1_maint:_numeric_names:_authors_list" title="Category:CS1 maint: numeric names: authors list">CS1 maint: numeric names: authors list</a></li><li><a href="/wiki/Category:CS1_errors:_periodical_ignored" title="Category:CS1 errors: periodical ignored">CS1 errors: periodical ignored</a></li><li><a href="/wiki/Category:Articles_with_short_description" title="Category:Articles with short description">Articles with short description</a></li><li><a href="/wiki/Category:Short_description_is_different_from_Wikidata" title="Category:Short description is different from Wikidata">Short description is different from Wikidata</a></li><li><a href="/wiki/Category:All_articles_with_unsourced_statements" title="Category:All articles with unsourced statements">All articles with unsourced statements</a></li><li><a href="/wiki/Category:Articles_with_unsourced_statements_from_May_2023" title="Category:Articles with unsourced statements from May 2023">Articles with unsourced statements from May 2023</a></li><li><a href="/wiki/Category:Articles_with_unsourced_statements_from_August_2023" title="Category:Articles with unsourced statements from August 2023">Articles with unsourced statements from August 2023</a></li><li><a href="/wiki/Category:Commons_category_link_is_on_Wikidata" title="Category:Commons category link is on Wikidata">Commons category link is on Wikidata</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> This page was last edited on 4 October 2024, at 12:47<span class="anonymous-show"> (UTC)</span>.</li> <li id="footer-info-copyright">Text is available under the <a href="/wiki/Wikipedia:Text_of_the_Creative_Commons_Attribution-ShareAlike_4.0_International_License" title="Wikipedia:Text of the Creative Commons Attribution-ShareAlike 4.0 International License">Creative Commons Attribution-ShareAlike 4.0 License</a>; additional terms may apply. By using this site, you agree to the <a href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Terms_of_Use" class="extiw" title="foundation:Special:MyLanguage/Policy:Terms of Use">Terms of Use</a> and <a href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Privacy_policy" class="extiw" title="foundation:Special:MyLanguage/Policy:Privacy policy">Privacy Policy</a>. Wikipedia® is a registered trademark of the <a rel="nofollow" class="external text" href="https://wikimediafoundation.org/">Wikimedia Foundation, Inc.</a>, a non-profit organization.</li> </ul> <ul id="footer-places"> <li id="footer-places-privacy"><a href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Privacy_policy">Privacy policy</a></li> <li id="footer-places-about"><a href="/wiki/Wikipedia:About">About Wikipedia</a></li> <li id="footer-places-disclaimers"><a href="/wiki/Wikipedia:General_disclaimer">Disclaimers</a></li> <li id="footer-places-contact"><a href="//en.wikipedia.org/wiki/Wikipedia:Contact_us">Contact Wikipedia</a></li> <li id="footer-places-wm-codeofconduct"><a href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Universal_Code_of_Conduct">Code of Conduct</a></li> <li id="footer-places-developers"><a href="https://developer.wikimedia.org">Developers</a></li> <li id="footer-places-statslink"><a href="https://stats.wikimedia.org/#/en.wikipedia.org">Statistics</a></li> <li id="footer-places-cookiestatement"><a href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Cookie_statement">Cookie statement</a></li> <li id="footer-places-mobileview"><a href="//en.m.wikipedia.org/w/index.php?title=Relative_risk&mobileaction=toggle_view_mobile" class="noprint stopMobileRedirectToggle">Mobile view</a></li> </ul> <ul id="footer-icons" class="noprint"> <li id="footer-copyrightico"><a href="https://wikimediafoundation.org/" class="cdx-button cdx-button--fake-button cdx-button--size-large cdx-button--fake-button--enabled"><img src="/static/images/footer/wikimedia-button.svg" width="84" height="29" alt="Wikimedia Foundation" loading="lazy"></a></li> <li id="footer-poweredbyico"><a href="https://www.mediawiki.org/" class="cdx-button cdx-button--fake-button cdx-button--size-large cdx-button--fake-button--enabled"><img src="/w/resources/assets/poweredby_mediawiki.svg" alt="Powered by MediaWiki" width="88" height="31" loading="lazy"></a></li> </ul> </footer> </div> </div> </div> <div class="vector-settings" id="p-dock-bottom"> <ul></ul> </div><script>(RLQ=window.RLQ||[]).push(function(){mw.config.set({"wgHostname":"mw-web.codfw.main-f69cdc8f6-f2r5r","wgBackendResponseTime":147,"wgPageParseReport":{"limitreport":{"cputime":"0.487","walltime":"0.650","ppvisitednodes":{"value":2057,"limit":1000000},"postexpandincludesize":{"value":94449,"limit":2097152},"templateargumentsize":{"value":3303,"limit":2097152},"expansiondepth":{"value":13,"limit":100},"expensivefunctioncount":{"value":3,"limit":500},"unstrip-depth":{"value":1,"limit":20},"unstrip-size":{"value":62172,"limit":5000000},"entityaccesscount":{"value":0,"limit":400},"timingprofile":["100.00% 478.898 1 -total"," 34.82% 166.729 1 Template:Reflist"," 22.87% 109.506 5 Template:Cite_journal"," 21.79% 104.334 4 Template:Navbox"," 17.79% 85.196 1 Template:Medical_research_studies"," 14.22% 68.094 1 Template:Short_description"," 13.76% 65.889 4 Template:Cn"," 11.06% 52.984 4 Template:Fix"," 9.64% 46.181 1 Template:Commons_category"," 9.27% 44.417 1 Template:Sister_project"]},"scribunto":{"limitreport-timeusage":{"value":"0.277","limit":"10.000"},"limitreport-memusage":{"value":6340612,"limit":52428800}},"cachereport":{"origin":"mw-web.codfw.main-f69cdc8f6-jqmcq","timestamp":"20241123124009","ttl":2592000,"transientcontent":false}}});});</script> <script type="application/ld+json">{"@context":"https:\/\/schema.org","@type":"Article","name":"Relative risk","url":"https:\/\/en.wikipedia.org\/wiki\/Relative_risk","sameAs":"http:\/\/www.wikidata.org\/entity\/Q2142611","mainEntity":"http:\/\/www.wikidata.org\/entity\/Q2142611","author":{"@type":"Organization","name":"Contributors to Wikimedia projects"},"publisher":{"@type":"Organization","name":"Wikimedia Foundation, Inc.","logo":{"@type":"ImageObject","url":"https:\/\/www.wikimedia.org\/static\/images\/wmf-hor-googpub.png"}},"datePublished":"2005-09-05T21:49:28Z","dateModified":"2024-10-04T12:47:16Z","image":"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/5\/5d\/Illustration_of_risk_reduction.svg","headline":"in statistics and epidemiology"}</script> </body> </html>