Improving the Measurement of Surgical Site Infection Risk Stratification/Outcome Detection

Exhibit 13. Accuracy of algorithm at each participating hospital

Accuracy of Algorithm at DH Accuracy of Algorithm at IH
    Routine Surveillance       Routine Surveillance  
Algorithm   SSI no SSI Total Algorithm   SSI no SSI Total
SSI 6 71 77 SSI 9 704 713
no SSI 7 1345 1352 no SSI 16 10857 10873
Total 13 1416 1429 Total 25 11561 11586
                   
  Sensitivity 46.2%   Sensitivity 36.0%
  Specificity 95.0%   Specificity 93.7%
  Positive Predictive Value 7.8%   Positive Predictive Value 1.3%
  Negative Predictive Value 99.5%   Negative Predictive Value 99.9%
Accuracy of Algorithm at VA SLCHCS Accuracy of Algorithm at VVMC
    Routine Surveillance       Routine Surveillance  
Algorithm   SSI no SSI Total Algorithm   SSI no SSI Total
SSI 2 33 35 SSI 0 17 17
no SSI 2 531 533 no SSI 3 832 835
Total 4 564 568 Total 3 849 852
                   
  Sensitivity 50.0%   Sensitivity 0.0%
  Specificity 94.1%   Specificity 98.0%
  Positive Predictive Value 5.7%   Positive Predictive Value 0.0%
  Negative Predictive Value 99.6%   Negative Predictive Value 99.6%

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