Partnership for Patients | Agency for Healthcare Research & Quality (AHRQ)

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Resources</a> </li> </ul> </li> </ul> </nav></div> <div id="basic-modal">  <article class="grid_9"> <aside class="three-col"> <div><div class="three-col-aside-flag"><h4>Alternate Formats</h4><div class="gray-aside-arrow"></div></div><ul><li> <span> <img src="/web/20140702204431im_/http://www.ahrq.gov/resources/file_logos/pdf.gif" alt="PDF file" title="PDF file" class="icon"/> <a href="/web/20140702204431/http://www.ahrq.gov/professionals/quality-patient-safety/pfp/pfphac.pdf">PDF version</a> - 249.3 KB</span> </li></ul></div> </aside> <h1>Partnership for Patients</h1> <h3>Methods Used To Estimate the Annual PFP National Hospital-Acquired Condition (HAC) Rate</h3><div class="page-description"><span>The Partnership for Patients initiative is a public-private partnership working to improve the quality, safety and affordability of health care for all Americans, including resources, measures, and reports on reducing healthcare associated conditions.</span></div> <p><em>Prepared by Noel Eldridge</em>.</p> <p>This document describes the methods AHRQ used to estimate the national rate of HACs for the Partnership for Patients (PFP) program. The estimate includes a wide variety of adverse events, including the nine HACs selected for special focus as part of the PFP, as well as several other HACs. Collectively, 28 specific measures are used: 14 measures to generate rates for the 9 specific PFP HACs and 14 measures to generate a summary rate for "all other" HACs. Of the 28 measures, 21 are from the AHRQ/CMS Medicare Patient Safety Monitoring System (MPSMS), 6 are from the AHRQ Patient Safety Indicators (PSIs), and 1 is based on National Healthcare Safety Network (NHSN) data from CDC. The measures are shown in <a href="#tab1">Table 1</a> below.</p> <a name="tab1" id="tab1"> </a> <h3>Table 1. Measures Used To Estimate the National Hospital-Acquired Condition Rate</h3> <table border="1" cellspacing="0" cellpadding="2" width="95%"> <tr valign="bottom"> <th scope="col">Partnership for Patients Hospital-Acquired Conditions</th> <th scope="col">Source</th> <th scope="col">Measure</th> </tr> <tr valign="top"> <td scope="row" rowspan="5">Adverse Drug Event (ADE)</td> <td align="center">MPSMS</td> <td>ADE Associated With Digoxin</td> </tr> <tr valign="top"> <td align="center">MPSMS</td> <td>ADE Associated With Hypoglycemic Agents</td> </tr> <tr valign="top"> <td align="center">MPSMS</td> <td>ADE Associated With IV Heparin</td> </tr> <tr valign="top"> <td align="center">MPSMS</td> <td>ADE Associated With Low Molecular Weight Heparin and Factor Xa Inhibitor</td> </tr> <tr valign="top"> <td align="center">MPSMS</td> <td>ADE Associated With Warfarin</td> </tr> <tr valign="top"> <td scope="row">CAUTI</td> <td align="center">MPSMS</td> <td>Catheter-Associated Urinary Tract Infections (physician diagnosed)</td> </tr> <tr valign="top"> <td scope="row">CLABSI</td> <td align="center">MPSMS</td> <td>Blood Stream Infections Associated With Central Venous Catheters</td> </tr> <tr valign="top"> <td scope="row">Falls</td> <td align="center">MPSMS</td> <td>In-Hospital Patient Falls</td> </tr> <tr valign="top"> <td scope="row">Obstetric Adverse Events</td> <td align="center">PSI</td> <td>OB Trauma in Vaginal Delivery With (PSI 18) and Without Instrument (PSI 19)</td> </tr> <tr valign="top"> <td scope="row">Pressure Ulcers</td> <td align="center">MPSMS</td> <td>Hospital-Acquired Pressure Ulcers</td> </tr> <tr valign="top"> <td scope="row">Surgical Site Infections</td> <td align="center">NHSN</td> <td>SSIs combined for 17 procedures based on CDC NHSN data</td> </tr> <tr valign="top"> <td scope="row">VAP</td> <td align="center">MPSMS</td> <td>Ventilator-Associated Pneumonia</td> </tr> <tr valign="top"> <td scope="row">VTE</td> <td align="center">MPSMS</td> <td>Postoperative Venous Thromboembolic Events</td> </tr> <tr valign="top"> <td scope="row" rowspan="14">"All Other" HACs (not identified for national focus as specific PFP HACs)</td> <td align="center">MPSMS</td> <td>Femoral Artery Puncture for Catheter Angiographic Procedures</td> </tr> <tr valign="top"> <td align="center">MPSMS</td> <td>Adverse Events Associated With Hip Joint Replacements</td> </tr> <tr valign="top"> <td align="center">MPSMS</td> <td>Adverse Events Associated With Knee Joint Replacements</td> </tr> <tr valign="top"> <td align="center">MPSMS</td> <td>Contrast Nephropathy Associated With Catheter Angiography</td> </tr> <tr valign="top"> <td align="center">MPSMS</td> <td>Hospital-Acquired Methicillin-Resistant <em>Staphylococcus aureus</em> (MRSA)</td> </tr> <tr valign="top"> <td align="center">MPSMS</td> <td>Hospital-Acquired Vancomycin-Resistant <em>Enterococcus</em> (VRE)</td> </tr> <tr valign="top"> <td align="center">MPSMS</td> <td>Hospital-Acquired Antibiotic-Associated <em>Clostridium difficile</em></td> </tr> <tr valign="top"> <td align="center">MPSMS</td> <td>Mechanical Complications Associated With Central Venous Catheters</td> </tr> <tr valign="top"> <td align="center">MPSMS</td> <td>Postoperative Cardiac Events for Cardiac and Noncardiac Surgeries</td> </tr> <tr valign="top"> <td align="center">MPSMS</td> <td>Postoperative Pneumonia</td> </tr> <tr valign="top"> <td align="center">PSI</td> <td>Iatrogenic Pneumothorax (PSI 6)</td> </tr> <tr valign="top"> <td align="center">PSI</td> <td>Post-Op Hemorrhage or Hematoma (PSI 9)</td> </tr> <tr valign="top"> <td align="center">PSI</td> <td>Post-Op Respiratory Failure (PSI 11)</td> </tr> <tr valign="top"> <td align="center">PSI</td> <td>Accidental Puncture or Laceration (PSI 15)</td> </tr> </table> <p><strong>Acronyms:</strong> Central Line-Associated Blood Stream Infection (CLABSI), Medicare Patient Safety Monitoring System (MPSMS), Patient Safety Indicators (PSIs), National Healthcare Safety Network (NHSN).</p> <p>Data from these 28 measures are combined to generate a summary national HAC rate that can be calculated annually, and that uses data from the AHRQ Healthcare Cost and Utilization Project (HCUP) on the annual number of hospital inpatient discharges as the denominator for the rate calculation. The details of how the national HAC rate is calculated for PFP are summarized below.</p> <ol> <li>The national rate of PFP HACs is calculated using the following variables: <ol type="a"> <li><strong>The rate of 21 MPSMS adverse events</strong> in the MPSMS sample provided by the CMS Inpatient Quality Reporting (IQR) sample of charts. The IQR sample for 2010 (the baseline year for the PFP national HAC rate) included approximately 34,000 charts from four patient groups: those included in the Surgical Care Improvement Project (SCIP) (major surgery) sample, and those with a principal diagnosis of acute myocardial infarction (AMI), congestive heart failure (CHF), or pneumonia. The IQR sample is limited to patients 18 years old and over. The rates of the 21 MPSMS adverse events are expressed as a rate for the whole sample population, rather than as a rate for the subpopulation that has the opportunity to experience the adverse event. For example, the CLABSI rate, like all the rates, uses all patients in the denominator, not just the patients who had a central line inserted during their hospital stay. To ensure that the estimated rate will not be affected by variation across years in the proportion of patients from each of the four groups (that is, SCIP, AMI, CHF, and pneumonia), for each of the 21 MPSMS HACs the estimate is a weighted average of the HAC rate for each group, where each group is given a 25% weight.</li> <li><strong>The national number of adverse events captured by PSIs 18 and 19 on obstetric injury</strong>, and the national number of four other PSIs (numbers 6, 9, 11, and 15) included among the "all other" HACs.</li> <li><strong>The national number of selected surgical site infections computed in a special calculation for the PFP by CDC.</strong> This calculation is based on NHSN data for 17 specific operations: the 12 "SCIP" operations and 5 others.</li> <li>The data described above for MPSMS are unlike the NHSN and PSI data in two ways. First, they originate as a rate, and second, they are an estimate for four specific subpopulations of hospital patients rather than all inpatients. In order to estimate MPSMS rates for all patients, rather than simply those with one of the four diagnoses included in the 2010-2012 IQR sample, we use data from the 2005-2006 MPSMS sample. Using the 2005-2006 MPSMS data, we estimate, for each of the 21 HACs included in the MPSMS analysis, the ratio of the rate of HACs for all patients in the sample to the rate of HACs for patients with the four diagnoses. As shown in <a href="#tab2">Table 2</a>, these ratios vary from .28 to 1.08, with 14 of 21 ratios being between .4 and .8 and the arithmetic mean of the ratios being .64. The fact that the ratios are, with one exception, all below 1.0 makes intuitive sense: it is credible that the rate of harm is greater for patients who have had major surgery, AMI, CHF, or pneumonia than it is for other patients.</li> <li>In order to estimate the rate of adverse events for each of the 21 HACs for all patients for which the MPSMS data are used, we multiply the adverse event rate for each of the 21 HACs for patients with one of the four conditions included in the 2010-2012 MPSMS sample as estimated in (a) above by the ratio of adverse events for all patients to adverse events for patients with one of the four diagnoses. Then, in order to estimate the number of adverse events for each of these 21 HACs, we multiply the estimated rate for all patients by the estimated total number of hospital discharges, where the estimate for the total number of hospital discharges comes from HCUP.</li> </ol> </li> <li>The estimated <strong>total count of annual HACs</strong> in the PFP national HAC rate is calculated as the sum of the total number of HACs for the 21 MPSMS HACs in (e) above, plus the estimated number of PSI HACs in (b), plus the number of NHSN-estimated HACs in (c).</li> <li>The <strong>PFP national HAC rate</strong> is the total HAC count in (2) above divided by the number of annual hospital inpatient discharges of patients at least 18 years old, as provided by HCUP. <a href="#tab3">Table 3</a> provides a summary of the data that shows how the 28 rates from all the measures are combined into the PFP national HAC rate.</li> <li>As of April 2014, this method has been repeated for 2011, and for 2012 using preliminary data for the number of annual hospital discharges. To be able to compare the estimated total number of HACs in 2011 and 2012 to 2010 without having that comparison be affected by changes in the total number of discharges, for 2011 and 2012, the data were normalized to generate national counts based on 32,750,000 discharges, which was the total number of discharges in 2010 for inpatients 18 years old and over. This method will be used again to finalize estimates for 2012, 2013, and 2014 as the data become available.</li> </ol> <a name="tab2" id="tab2"> </a> <h3>Table 2. Summary of Ratio Calculations</h3> <table border="1" cellspacing="0" cellpadding="2" width="95%"><thead> <tr valign="bottom"> <th scope="col">PFP HAC Category</th> <th scope="col">MPSMS Measure</th> <th scope="col">Rate per 1,000 Discharges in FFS Medicare Patients >64 Years: All Diagnoses (CY 2005-2006 Combined)</th> <th scope="col">Rate per 1,000 Discharges in FFS Medicare Patients >64 Years: Four Principal Diagnoses Only: AMI, HF, Pneumonia, & SCIP (CY 2005-2006 Combined)</th> <th scope="col">Ratio (Calculated as All Diagnoses Rate/Four Principal Diagnoses Rate)</th> </tr> </thead> <tr valign="top"> <td scope="row"><strong>ADE</strong></td> <td>ADE Associated With Digoxin</td> <td align="center">0.19</td> <td align="center">0.17</td> <td align="center">1.08</td> </tr> <tr valign="top"> <td scope="row"><strong>ADE</strong></td> <td>ADE Associated With Hypoglycemic Agents</td> <td align="center">34.06</td> <td align="center">44.28</td> <td align="center">0.77</td> </tr> <tr valign="top"> <td scope="row"><strong>ADE</strong></td> <td>ADE Associated With IV Heparin</td> <td align="center">10.22</td> <td align="center">20.59</td> <td align="center">0.50</td> </tr> <tr valign="top"> <td scope="row"><strong>ADE</strong></td> <td>ADE Associated With Low Molecular Weight Heparin and Factor Xa Inhibitor</td> <td align="center">13.90</td> <td align="center">25.24</td> <td align="center">0.55</td> </tr> <tr valign="top"> <td scope="row"><strong>ADE</strong></td> <td>ADE Associated With Warfarin</td> <td align="center">10.85</td> <td align="center">17.40</td> <td align="center">0.62</td> </tr> <tr valign="top"> <td scope="row"><strong>CLABSI</strong></td> <td>Blood Stream Infections Associated With Central Venous Catheters</td> <td align="center">1.44</td> <td align="center">2.24</td> <td align="center">0.64</td> </tr> <tr valign="top"> <td scope="row"><strong>CAUTI</strong></td> <td>Catheter-Associated Urinary Tract Infections</td> <td align="center">18.80</td> <td align="center">25.58</td> <td align="center">0.73</td> </tr> <tr valign="top"> <td scope="row"><strong>Falls</strong></td> <td>In-Hospital Patient Falls</td> <td align="center">12.25</td> <td align="center">14.56</td> <td align="center">0.84</td> </tr> <tr valign="top"> <td scope="row"><strong>Pressure Ulcers</strong></td> <td>Hospital-Acquired Pressure Ulcers</td> <td align="center">53.03</td> <td align="center">62.45</td> <td align="center">0.85</td> </tr> <tr valign="top"> <td scope="row"><strong>VAP</strong></td> <td>Ventilator-Associated Pneumonia</td> <td align="center">1.30</td> <td align="center">2.67</td> <td align="center">0.49</td> </tr> <tr valign="top"> <td scope="row"><strong>VTE</strong></td> <td>Postoperative Venous Thromboembolic Events</td> <td align="center">1.84</td> <td align="center">4.39</td> <td align="center">0.42</td> </tr> <tr valign="top"> <td scope="row"><strong>All Other HACs</strong></td> <td>Contrast Nephropathy Associated With Catheter Angiography</td> <td align="center">8.46</td> <td align="center">18.35</td> <td align="center">0.46</td> </tr> <tr valign="top"> <td scope="row"><strong>All Other HACs</strong></td> <td>Femoral Artery Puncture for Catheter Angiographic Procedures</td> <td align="center">3.02</td> <td align="center">3.62</td> <td align="center">0.83</td> </tr> <tr valign="top"> <td scope="row"><strong>All Other HACs</strong></td> <td>Hospital-Acquired Antibiotic-Associated <em>C. difficile</em></td> <td align="center">4.21</td> <td align="center">5.17</td> <td align="center">0.81</td> </tr> <tr valign="top"> <td scope="row"><strong>All Other HACs</strong></td> <td>Hospital-Acquired MRSA</td> <td align="center">1.23</td> <td align="center">1.55</td> <td align="center">0.79</td> </tr> <tr valign="top"> <td scope="row"><strong>All Other HACs</strong></td> <td>Hospital-Acquired VRE</td> <td align="center">0.37</td> <td align="center">0.52</td> <td align="center">0.72</td> </tr> <tr valign="top"> <td scope="row"><strong>All Other HACs</strong></td> <td>Adverse Events Associated With Hip Joint Replacements</td> <td align="center">1.02</td> <td align="center">3.70</td> <td align="center">0.28</td> </tr> <tr valign="top"> <td scope="row"><strong>All Other HACs</strong></td> <td>Adverse Events Associated With Knee Joint Replacements</td> <td align="center">1.02</td> <td align="center">3.62</td> <td align="center">0.28</td> </tr> <tr valign="top"> <td scope="row"><strong>All Other HACs</strong></td> <td>Mechanical Complications Associated With Central Venous Catheters</td> <td align="center">4.00</td> <td align="center">5.25</td> <td align="center">0.76</td> </tr> <tr valign="top"> <td scope="row"><strong>All Other HACs</strong></td> <td>Postoperative Cardiac Events for Cardiac and Noncardiac Surgeries</td> <td align="center">4.00</td> <td align="center">8.70</td> <td align="center">0.46</td> </tr> <tr valign="top"> <td scope="row"><strong>All Other HACs</strong></td> <td>Postoperative Pneumonia</td> <td align="center">4.39</td> <td align="center">9.73</td> <td align="center">0.45</td> </tr> </table> <p> </p> <a name="tab3" id="tab3"> </a> <h3>Table 3. 2010 Estimated Final HAC Data (Finalized May 2012)</h3> <table border="1" cellspacing="0" cellpadding="2" width="95%"><thead> <tr valign="bottom"> <th colspan="3" scope="col">PFP Hospital-Acquired Conditions</th> <th colspan="3" scope="col">Information on 2010 Measured HACs Baseline</th> </tr> <tr valign="bottom"> <th scope="col">Partnership for Patients Hospital-Acquired Condition</th> <th scope="col">Source</th> <th scope="col">Measure</th> <th scope="col">2010 PFP HACs (Not Rounded)</th> <th scope="col">2010 (18+ y.o.) Discharges (HCUP)</th> <th scope="col">2010 PFP Measured HACs per 1,000 Discharges</th> </tr> </thead> <tr valign="top"> <td scope="row" rowspan="6">ADE</td> <td align="center">MPSMS</td> <td>ADE Associated With Digoxin</td> <td align="center">11,650</td> <td align="center">32,750,000</td> <td align="center">0.356</td> </tr> <tr valign="top"> <td align="center">MPSMS</td> <td>ADE Associated With Hypoglycemic Agents</td> <td align="center">930,863</td> <td align="center">32,750,000</td> <td align="center">28.423</td> </tr> <tr valign="top"> <td align="center">MPSMS</td> <td>ADE Associated With IV Heparin</td> <td align="center">170,973</td> <td align="center">32,750,000</td> <td align="center">5.221</td> </tr> <tr valign="top"> <td align="center">MPSMS</td> <td>ADE Associated With Low Molecular Weight Heparin and Factor Xa Inhibitor</td> <td align="center">335,826</td> <td align="center">32,750,000</td> <td align="center">10.254</td> </tr> <tr valign="top"> <td align="center">MPSMS</td> <td>ADE Associated With Warfarin</td> <td align="center">171,609</td> <td align="center">32,750,000</td> <td align="center">5.240</td> </tr> <tr valign="top"> <td align="center">MPSMS</td> <td>Total ADE (sum of above 5 measures)</td> <td align="center">1,620,921</td> <td align="center">32,750,000</td> <td align="center">49.496</td> </tr> <tr valign="top"> <td>CAUTI</td> <td align="center">MPSMS</td> <td>Catheter-Associated Urinary Tract Infections</td> <td align="center">401,139</td> <td align="center">32,750,000</td> <td align="center">12.249</td> </tr> <tr valign="top"> <td>CLABSI</td> <td align="center">MPSMS</td> <td>Blood Stream Infections Associated With Central Venous Catheters</td> <td align="center">18,091</td> <td align="center">32,750,000</td> <td align="center">0.552</td> </tr> <tr valign="top"> <td>Falls</td> <td align="center">MPSMS</td> <td>In-Hospital Patient Falls</td> <td align="center">262,317</td> <td align="center">32,750,000</td> <td align="center">8.010</td> </tr> <tr valign="top"> <td>Obstetric Adverse Events</td> <td align="center">PSI</td> <td>OB Trauma in Vaginal Delivery With (PSI 18) and Without Instrument (PSI 19)</td> <td align="center">82,300</td> <td align="center">32,750,000</td> <td align="center">2.513</td> </tr> <tr valign="top"> <td>Pressure Ulcer</td> <td align="center">MPSMS</td> <td>Hospital-Acquired Pressure Ulcers</td> <td align="center">1,317,211</td> <td align="center">32,750,000</td> <td align="center">40.220</td> </tr> <tr valign="top"> <td>Surgical Site Infection</td> <td align="center">NHSN</td> <td>SSIs for 17 procedures in 2010 with CDC data</td> <td align="center">96,467</td> <td align="center">32,750,000</td> <td align="center">2.946</td> </tr> <tr valign="top"> <td>VAP</td> <td align="center">MPSMS</td> <td>Ventilator-Associated Pneumonia</td> <td align="center">37,604</td> <td align="center">32,750,000</td> <td align="center">1.148</td> </tr> <tr valign="top"> <td>VTE (updated June 2014)</td> <td align="center">MPSMS</td> <td>Postoperative Venous Thromboembolic Events</td> <td align="center">27,564</td> <td align="center">32,750,000</td> <td align="center">0.842</td> </tr> <tr valign="top"> <td scope="row" rowspan="15">All Other Hospital- Acquired Conditions</td> <td align="center">MPSMS</td> <td>Femoral Artery Puncture for Catheter Angiographic Procedures</td> <td align="center">75,804</td> <td align="center">32,750,000</td> <td align="center">2.315</td> </tr> <tr valign="top"> <td align="center">MPSMS</td> <td>Adverse Events Associated With Hip Joint Replacements</td> <td align="center">30,413</td> <td align="center">32,750,000</td> <td align="center">0.929</td> </tr> <tr valign="top"> <td align="center">MPSMS</td> <td>Adverse Events Associated With Knee Joint Replacements</td> <td align="center">28,855</td> <td align="center">32,750,000</td> <td align="center">0.881</td> </tr> <tr valign="top"> <td align="center">MPSMS</td> <td>Contrast Nephropathy Associated With Catheter Angiography</td> <td align="center">227,419</td> <td align="center">32,750,000</td> <td align="center">6.944</td> </tr> <tr valign="top"> <td align="center">MPSMS</td> <td>Hospital-Acquired MRSA</td> <td align="center">14,828</td> <td align="center">32,750,000</td> <td align="center">0.453</td> </tr> <tr valign="top"> <td align="center">MPSMS</td> <td>Hospital-Acquired VRE</td> <td align="center">13,186</td> <td align="center">32,750,000</td> <td align="center">0.403</td> </tr> <tr valign="top"> <td align="center">MPSMS</td> <td>Hospital-Acquired Antibiotic-Associated <em>C. difficile</em></td> <td align="center">86,916</td> <td align="center">32,750,000</td> <td align="center">2.654</td> </tr> <tr valign="top"> <td align="center">MPSMS</td> <td>Mechanical Complications Associated With Central Venous Catheters</td> <td align="center">114,689</td> <td align="center">32,750,000</td> <td align="center">3.502</td> </tr> <tr valign="top"> <td align="center">MPSMS</td> <td>Postoperative Cardiac Events for Cardiac and Noncardiac Surgeries</td> <td align="center">43,120</td> <td align="center">32,750,000</td> <td align="center">1.317</td> </tr> <tr valign="top"> <td align="center">MPSMS</td> <td>Postoperative Pneumonia</td> <td align="center">96,896</td> <td align="center">32,750,000</td> <td align="center">2.959</td> </tr> <tr valign="top"> <td align="center">PSI</td> <td>Iatrogenic Pneumothorax (PSI 6)</td> <td align="center">13,490</td> <td align="center">32,750,000</td> <td align="center">0.412</td> </tr> <tr valign="top"> <td align="center">PSI</td> <td>Post-Op Hemorrhage or Hematoma (PSI 9)</td> <td align="center">20,691</td> <td align="center">32,750,000</td> <td align="center">0.632</td> </tr> <tr valign="top"> <td align="center">PSI</td> <td>Post-Op Respiratory Failure (PSI 11)</td> <td align="center">50,058</td> <td align="center">32,750,000</td> <td align="center">1.528</td> </tr> <tr valign="top"> <td align="center">PSI</td> <td>Accidental Puncture or Laceration (PSI 15)</td> <td align="center">77,194</td> <td align="center">32,750,000</td> <td align="center">2.357</td> </tr> <tr valign="top"> <td align="center">MPSMS & PSI</td> <td>Total All Other HACs (sum of above 14 measures)</td> <td align="center">893,559</td> <td align="center">32,750,000</td> <td align="center">27.284</td> </tr> <tr valign="top"> <td scope="row" colspan="3"><strong>Total PFP HACs, and HACs per 1,000 discharges</strong><strong><strong> (updated June 2014)</strong></strong></td> <td align="center">4,757,173</td> <td> </td> <td align="center">145.26</td> </tr> <tr valign="top"> <td scope="row" colspan="3"><strong>Total PFP HACs, and HACs per 1,000 discharges (rounded) </strong><strong><strong> (updated June 2014)</strong></strong></td> <td align="center">4,757,000</td> <td> </td> <td align="center">145</td> </tr> </table> <br/> <p>Ideally, we would have estimated the adverse event rates for the 21 MPSMS HACs using data from patients with all diagnoses, rather than being restricted to the four diagnoses that were included in the 2010 IQR sample. Because the 2010 IQR sample did not include patients with all diagnoses, we used the 2005 and 2006 MPSMS data, as described above, to estimate the ratio of adverse events for all diagnoses to adverse events for the four diagnoses. However, the 2005 and 2006 sample was restricted to Medicare patients age 65 and over, and it is possible that the ratios we estimated with those data are not correct for all patients. It makes sense to think, for example, that because many of the adverse events we measure are less common among obstetric patients than among other patients, the ratio for all patients would be lower than the ratio for Medicare patients 65 years old and over. It is also possible that the ratio has changed from 2005-2006 to the present.</p> <p>New MPSMS data are now available based on an expanded 2012-2013 IQR sample that includes charts from patients with diagnoses other than those in the four diagnosis groups present in the 2010-2011 IQR sample. Use of these data may enable the development of a new method that could provide an improved estimate of the PFP national HAC rate. Information from these 2012 and 2013 charts is currently being analyzed to ensure the reliability of the MPSMS rates and other data present in charts from these additional IQR samples. Preliminary data and calculations based on data that include the new IQR samples suggest that a method that includes data from these additional charts would produce somewhat lower national HAC rates than have been computed to date, but not necessarily change the annual trends in the HAC rates.</p> <div class="current-as-of">Current as of June 2014</div> <div class="citation"> <span>Internet Citation: Partnership for Patients: Methods Used To Estimate the Annual PFP National Hospital-Acquired Condition (HAC) Rate. June 2014. Agency for Healthcare Research and Quality, Rockville, MD. http://www.ahrq.gov/professionals/quality-patient-safety/pfp/index.html</span> <div class="citation-flag"></div> </div> </article>  </div> </div> </div> </div> <footer> <div id="top-button-container" class="container_12"> <a href="#tiptop" id="top-button">Back to top<img src="/web/20140702204431im_/http://www.ahrq.gov/resources/img/top-button-icon.png" alt="Go back to top" width="25" height="25"/></a> </div> <div id="footer-separator"></div> <div id="median-container"> <div id="median" class="container_12"> <a href="/web/20140702204431/http://www.ahrq.gov/index.html" class="grid_2 alpha"><img src="/web/20140702204431im_/http://www.ahrq.gov/resources/img/ahrq-footer-logo.png" alt="AHRQ" width="70" height="30"/></a> <nav id="legal"><ul class="grid_6"> <li> <span><a href="/web/20140702204431/http://www.ahrq.gov/policy/electronic/accessibility/index.html">Accessibility</a></span> </li><li> <span><a 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