NEDS Overview

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html lang="en"> <head><script type="text/javascript" src="/_static/js/bundle-playback.js?v=HxkREWBo" charset="utf-8"></script> <script type="text/javascript" src="/_static/js/wombat.js?v=txqj7nKC" charset="utf-8"></script> <script>window.RufflePlayer=window.RufflePlayer||{};window.RufflePlayer.config={"autoplay":"on","unmuteOverlay":"hidden"};</script> <script type="text/javascript" src="/_static/js/ruffle/ruffle.js"></script> <script type="text/javascript"> __wm.init("https://web.archive.org/web"); __wm.wombat("http://www.hcup-us.ahrq.gov/nedsoverview.jsp","20140717103756","https://web.archive.org/","web","/_static/", "1405593476"); </script> <link rel="stylesheet" type="text/css" href="/_static/css/banner-styles.css?v=S1zqJCYt" /> <link rel="stylesheet" type="text/css" href="/_static/css/iconochive.css?v=3PDvdIFv" />  <title>NEDS Overview</title> <link rel="stylesheet" href="/web/20140717103756cs_/http://www.hcup-us.ahrq.gov/HCUP_US.css"> <meta name="keywords" content="hcup, healthcare cost and utilization project, health, healthcare, health statistics, data analysis, analysis, data collection, data processing, databases, research">  <script type="text/javascript"> var steering = false; var team = false; var partner = false; var nhqrdr = false; </script> <script type="text/javascript" src="/web/20140717103756js_/http://www.hcup-us.ahrq.gov/menu/c_config.js"></script> <script type="text/javascript" src="/web/20140717103756js_/http://www.hcup-us.ahrq.gov/menu/c_smartmenus.js"></script>  </head> <body> <div id="skipmenu"> <a href="#skip" class="skippy">Skip Navigation</a> <a name="top"></a> </div> <div id="hideShow"> <table summary="layout" width="100%" cellspacing="2" cellpadding="0" border="0"> <tr> <td align="center" class="logoPanel" bgcolor="#006699"> <div id="logo"> <a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/"><img src="/web/20140717103756im_/http://www.hcup-us.ahrq.gov/images/HCUP_logo/hcuplogo_smaller_final.jpg" alt="Healthcare Cost and Utilization Project logo"></a> </div> </td> <td bgcolor="#66cccc" class="bannerPanel"><br> <div class="bannertitleinteriorpgs">Overview of the Nationwide Emergency Department Sample (NEDS)</div> <div class="bannertext">The NEDS is a set of hospital-based emergency department databases included in the HCUP family. These databases are created by AHRQ through a Federal-State-Industry partnership.</div> </td> <td bgcolor="#66cccc" valign="middle" class="searchPanel"> <form method="get" action="/web/20140717103756/http://www.hcup-us.ahrq.gov/search/Search.action"> <table cellpadding="0px" cellspacing="0px"> <tr> <td class="searchBox"> <input type="text" name="query"> </td> <td valign="middle" class="searchIcon"> <input type="image" src="/web/20140717103756im_/http://www.hcup-us.ahrq.gov/images/search-icon2.png" placeholder="Search" alt="search" class="search-icon" title="Search" width="10" height="11"> </td> </tr> </table> </form> </td> </tr> <tr> <td width="122" bgcolor="#66cccc"> </td> <td width="100%" colspan="2"><ul id="Menu1" class="MM"> <li><a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/"><br/>Home</a> <ul> <li><a class="NOLINK">What is HCUP?</a> <ul> <li><a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/overview.jsp">Overview of HCUP</a></li> <li><a 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href="/web/20140717103756/http://www.hcup-us.ahrq.gov/databases.jsp">Nationwide Emergency Department Sample (NEDS)</a> <ul> <li><a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/nedsoverview.jsp">Overview of the NEDS</a> <ul> <li><a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/partners.jsp?NEDS">HCUP Partners in the NEDS</a></li> </ul> </li> <li><a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/tech_assist/centdist.jsp">Obtaining the NEDS</a> <ul> <li><a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/tech_assist/dua.jsp">HCUP Data Use Agreement Training</a></li> <li><a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/team/NationwideDUA.jsp">Nationwide Data Use Agreement</a></li> </ul> </li> <li><a class="NOLINK">Using the NEDS</a> <ul> <li><a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/db/nation/neds/nedsdbdocumentation.jsp">NEDS Database Documentation </a></li> <li><a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/db/nation/neds/nedsrelatedreports.jsp">NEDS Related Reports</a></li> <li><a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/db/publishing.jsp">Publishing with HCUP Data</a></li> </ul> </li> </ul> </li> <li><a class="NOLINK"><strong>State-Specific HCUP Databases</strong></a></li> <li><a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/databases.jsp">State Inpatient Databases (SID)</a> <ul> <li><a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/sidoverview.jsp">Overview of the SID</a> <ul> <li><a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/partners.jsp?SID">HCUP Partners in the SID</a></li> </ul> </li> <li><a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/tech_assist/centdist.jsp">Obtaining the SID</a> <ul> <li><a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/tech_assist/dua.jsp">HCUP Data Use Agreement Training</a></li> <li><a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/team/StateDUA.jsp">State Database Data Use Agreement</a></li> </ul> </li> <li><a class="NOLINK">Using the SID</a> <ul> <li><a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/db/state/siddbdocumentation.jsp">SID Database Documentation</a></li> <li><a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/db/state/sidrelatedreports.jsp">SID Related Reports</a></li> <li><a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/db/publishing.jsp">Publishing with HCUP Data</a></li> </ul> </li> </ul> </li> <li><a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/databases.jsp">State Ambulatory Surgery and Services Databases (SASD)</a> <ul> <li><a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/sasdoverview.jsp">Overview of the SASD</a> <ul> <li><a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/partners.jsp?SASD">HCUP Partners in the SASD</a></li> </ul> </li> <li><a 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href="/web/20140717103756/http://www.hcup-us.ahrq.gov/datainnovations/clinicaldata/poaback.jsp">Background</a></li> <li><a class="NOLINK">Tools</a> <ul> <li><a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/datainnovations/clinicaldata/tktt.jsp">Training Tools</a></li> <li><a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/datainnovations/clinicaldata/tkds.jsp">Data Standards and Transmission Tools</a></li> <li><a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/datainnovations/clinicaldata/tkfeedback.jsp">Feedback and Reporting Tools</a></li> </ul> </li> <li><a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/datainnovations/clinicaldata/pilot.jsp">Pilot and Planning Projects</a></li> </ul> </li> </ul> </li> </ul> </td> </tr> <tr><td colspan="3"><a name="skip"></a></td></tr> </table> </div> <table summary="layout" width="100%" border="0" cellspacing="2" cellpadding="4"> <tr><td> </td></tr> <tr> <td width="100%" align="left" valign="top"><div class="texttitle">The Nationwide Emergency Department Sample </div><br> <div class="pagetext">The Nationwide Emergency Department Sample (NEDS) is part of a family of databases and software tools developed for the <a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/overview.jsp">Healthcare Cost and Utilization Project (HCUP)</a>. The NEDS is the largest all-payer emergency department (ED) database in the United States, yielding national estimates of hospital-based ED visits. Unweighted, it contains data from approximately 30 million discharges each year. Weighted, it estimates roughly 130 million ED visits. <br><br> Developed through a Federal-State-Industry partnership sponsored by the <a href="https://web.archive.org/web/20140717103756/http://www.ahrq.gov/" target="_blank">Agency for Healthcare Research and Quality</a>, HCUP data inform decisionmaking at the national, State, and community levels. <br><br> This page provides an overview of the NEDS. For more details, see <a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/db/nation/neds/nedsdbdocumentation.jsp">NEDS Database Documentation</a> and the <em>Introduction to the NEDS, 2011</em> (<a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/db/nation/neds/NEDS2011Introduction01142014.pdf" target="_blank">PDF</a> file, 858 KB; <a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/db/nation/neds/NEDS_Introduction_2011.jsp">HTML</a>).  <br><br> Contents:<a name="return"></a> <ul> <li><a href="#about">About the NEDS</a></li> <li><a href="#data">NEDS Data Elements</a></li> <li><a href="#research">NEDS Areas of Research and HCUP Publications</a></li> <li><a href="#purchase">Purchase the NEDS</a></li> <li><a href="#hardware">NEDS Hardware and Software Requirements</a></li> </ul> <br> </div> </td></tr> <tr><td> <div class="texttitle"><a name="about">About the NEDS</a></div><div class="pagetext"> <br> Sampled from the <a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/sidoverview.jsp">State Inpatient Databases (SID)</a> and <a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/seddoverview.jsp">State Emergency Department Databases (SEDD)</a>, HCUP's NEDS that can be used to create national and regional estimates of ED care. The SID contain information on patients initially seen in the ED and then admitted to the same hospital. The SEDD capture information on ED visits that do not result in an admission (i.e., treat-and-release visits and transfers to another hospital). <br><br> NEDS data are available from 2006 through 2011, which allows researchers to analyze trends over time. Key features of the most recent NEDS database year (2011) include: <ul> <li>A large sample size, which provides sufficient data for analysis across hospital types and the study of relatively uncommon disorders and procedures</li> <li>Discharge data for ED visits from over 950 hospitals located in 30 States, approximating a 20-percent stratified sample of U.S. hospital-based EDs</li> <li>Demographic data such as hospital and patient characteristics, geographic area, and the nature of ED visits (e.g., common reasons for ED visits, including injuries)</li> <li>ED charge information for over 85 percent of patients, including individuals covered by Medicare, Medicaid, or private insurance, as well as those who are uninsured </li> <li>Children's hospitals with trauma centers, which are classified with adult and pediatric trauma centers in the current versions of the NEDS.</li> </ul> Information on previous years of the NEDS may be found in the <em>Introduction to the NEDS, 2011</em> (<a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/db/nation/neds/NEDS2011Introduction01142014.pdf" target="_blank">PDF</a> file, 858 KB; <a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/db/nation/neds/NEDS_Introduction_2011.jsp">HTML</a>). </div> </td></tr> <tr><td align="left" class="pagetext"><a href="#return">Return to Contents</a></td></tr> <tr><td> </td></tr> <tr><td> <div class="texttitle"><a name="data">NEDS Data Elements</a></div><div class="pagetext"> <br> The NEDS contains clinical and resource-use information that is included in a typical discharge abstract, with safeguards to protect the privacy of individual patients, physicians, and hospitals (as required by data sources). The NEDS is composed of more than 100 clinical and nonclinical variables for each hospital stay. These include: <ul> <li>International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM) diagnosis and external cause of injury codes</li> <li>ICD-9-CM and Current Procedural Terminology, Fourth Edition (CPT®-4) procedure codes</li> <li>Identification of injury-related ED visits including mechanism, intent, and severity of injury </li> <li>Admission and discharge status</li> <li>Patient demographics characteristics (e.g., sex, age, urban-rural designation of residence, national quartile of median household income for patient's ZIP Code)</li> <li>Expected payment source</li> <li>Total ED charges (for ED visits) and total hospital charges (for inpatient stays for ED visits that result in admission) </li> <li>Hospital characteristics (e.g., region, trauma center indicator, urban-rural location, teaching status) </li> </ul> <a href="#return">Return to Contents</a></div></td></tr> <tr><td> </td></tr> <tr><td> <div class="texttitle"><a name="research">NEDS Areas of Research and HCUP Publications</a></div><div class="pagetext"> <br> As a uniform, multi-State database, the NEDS promotes comparative studies of health care services and supports health care policy and research on a variety of topics, including: <ul> <li>Use of and charges for ED services</li> <li>Medical treatment effectiveness</li> <li>Quality of ED care</li> <li>Impact of health policy changes </li> <li>Access to care</li> <li>Utilization of health services by special populations </li> </ul> The NEDS is used in a variety of publications: <ul> <li><a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/reports/statbriefs/statbriefs.jsp">HCUP Statistical Briefs</a> highlight a variety of health topics.</li> <li>Use the <a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/reports/pubsearch/pubsearch.jsp">HCUP Publications Search Tool</a> to find publications using the NEDS.</li> <li>Review featured publications on the <a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/reports/spotlights.jsp">HCUP Research Spotlights</a> page.</li> <li>Read publications by the winners of the <a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/awards.jsp">HCUP Outstanding Article of the Year Awards</a>.</li> </ul> <a href="#return">Return to Contents</a> </div></td></tr> <tr><td> </td></tr> <tr><td> <div class="texttitle"><a name="purchase">Purchase the NEDS</a></div><div class="pagetext"> <br> NEDS releases for data years 2006 through 2011 are available for purchase through the <a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/tech_assist/centdist.jsp">HCUP Central Distributor</a>. <br><br> Prior to purchasing HCUP data, all individuals are required to take the online <a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/tech_assist/dua.jsp">HCUP Data Use Agreement Training Course</a>, and users of the NEDS must read and sign the Data Use Agreement for Nationwide Databases (<a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/team/HCUP_Nationwide_DUA_051614.pdf" target="_blank">PDF</a> file, 55 KB; <a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/team/NationwideDUA.jsp">HTML</a>). <br><br> Instructions for purchasing the NEDS are available in the <a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/db/nation/neds/NEDSAppKitFinal.pdf" target="_blank">National Emergency Department Sample (NEDS) Application Kit</a> (PDF file, 130 KB). <br><br> Questions regarding purchasing databases can be directed to the HCUP Central Distributor: <p style="margin-left: 35px;"> E-mail: <a href="https://web.archive.org/web/20140717103756/mailto:HCUPDistributor@AHRQ.gov">HCUPDistributor@AHRQ.gov</a> <br> Telephone: (866) 556-4287 (toll free) <br> Fax: (866) 792-5313 (toll free) </p> <a href="#return">Return to Contents</a></div></td></tr> <tr><td> </td></tr> <tr><td> <div class="texttitle"><a name="hardware">NEDS Hardware and Software Requirements</a></div><div class="pagetext"> <br> The NEDS data set is extremely large. The data are sent in comma-separated value (CSV) format compressed with WinZip®. In order to load and analyze the NEDS data on a computer, you will need the following: <ul> <li>A DVD drive</li> <li>A hard drive with 15 gigabytes of space available</li> <li>A third-party zip utility such as ZIP Reader, 7-Zip, or WinZip®</li> <li>SAS®, SPSS®, Stata® or similar analysis software</li> </ul> The data set includes weights for producing national and regional estimates. NEDS documentation and tools, including programs for loading the ASCII file into SAS, SPSS, or Stata, are also available on the <a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/db/nation/neds/nedsdbdocumentation.jsp">NEDS Database Documentation</a> page. <br><br> Please note the following based on the software you plan to use: <ul> <li>In total, the comma-delimited version of the NEDS is almost 14 gigabytes (GB).</li> <li>The NEDS files loaded into SAS are about 11 GB. Most SAS data steps will require twice the storage of the file, so that the input and output files can coexist. The largest use of space typically occurs during a sort, which requires work space approximately three times the size of the file. Thus, the NEDS files would require approximately 33 GB of available workspace to perform a sort. </li> <li>The NEDS files loaded into SPSS are under 30 GB.</li> <li>Because Stata loads the entire file into memory, it may not be possible to load every data element in the NEDS Core file into Stata. Stata users will need to maximize memory and use the "_skip" option to select a subset of variables. More details are provided in the <a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/db/nation/neds/nedsstataloadprog.jsp">Stata load programs</a>.</li> </ul> With a file this size and without careful planning, space could easily become a problem in a multi-step program with the NEDS. It is not unusual to have several versions of a file marking different steps while preparing it for analysis and more versions for the actual analyses; therefore, users should be aware that the amount of space required can escalate rapidly. <br><br> <a href="#return">Return to Contents</a></div></td></tr> <tr><td> </td></tr> </table> <hr width="75%" align="center" class="hrruleblue"> <table width="100%"> <tr> <td align="center" class="citationtext"> Internet Citation: NEDS Overview. Healthcare Cost and Utilization Project (HCUP). June 2014. Agency for Healthcare Research and Quality, Rockville, MD. www.hcup-us.ahrq.gov/nedsoverview.jsp. </td> </tr> <tr> <td align="center" class="citationtext"> <a href="/web/20140717103756/http://www.hcup-us.ahrq.gov/viewing_prntg.jsp">Are you having problems viewing or printing pages on this Website?</a> </td> </tr> <tr> <td align="center" class="citationtext"> If you have comments, suggestions, and/or questions, please contact <a href="https://web.archive.org/web/20140717103756/mailto:hcup@ahrq.gov">hcup@ahrq.gov.</a> </td> </tr> <tr> <td align="center" class="citationtext"> <a href="https://web.archive.org/web/20140717103756/http://www.ahrq.gov/policy/electronic/privacy/index.html" target="_blank">Privacy Notice</a>, <a href="https://web.archive.org/web/20140717103756/http://www.hhs.gov/plugins.html" target="_blank">Viewers & Players</a> </td> </tr> <tr> <td align="center" class="citationtext">Last modified 6/24/14</td> </tr> </table> </body> </html>

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NEDS Overview