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Exhibit 13. Accuracy of algorithm at each participating hospital

Accuracy of Algorithm at DHAccuracy of Algorithm at IH
  Routine Surveillance   Routine Surveillance 
Algorithm SSIno SSITotalAlgorithm SSIno SSITotal
SSI67177SSI9704713
no SSI713451352no SSI161085710873
Total1314161429Total251156111586
          
 Sensitivity46.2% Sensitivity36.0%
 Specificity95.0% Specificity93.7%
 Positive Predictive Value7.8% Positive Predictive Value1.3%
 Negative Predictive Value99.5% Negative Predictive Value99.9%
Accuracy of Algorithm at VA SLCHCSAccuracy of Algorithm at VVMC
  Routine Surveillance   Routine Surveillance 
Algorithm SSIno SSITotalAlgorithm SSIno SSITotal
SSI23335SSI01717
no SSI2531533no SSI3832835
Total4564568Total3849852
          
 Sensitivity50.0% Sensitivity0.0%
 Specificity94.1% Specificity98.0%
 Positive Predictive Value5.7% Positive Predictive Value0.0%
 Negative Predictive Value99.6% Negative Predictive Value99.6%

DH = Denver Health; IH = Intermountain Healthcare; VA SLC HCS = Veterans Affairs Salt Lake City Health Care System; VVMC = Vail Valley Medical Center; SSI = surgical site infection.

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Page last reviewed December 2012
Internet Citation: Exhibit 13. Accuracy of algorithm at each participating hospital. December 2012. Agency for Healthcare Research and Quality, Rockville, MD. http://www.ahrq.gov/research/findings/final-reports/ssi/ssiexh13.html