ssiexh13.htm

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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Current as of December 2012

Internet Citation: ssiexh13.htm. December 2012. Agency for Healthcare Research and Quality, Rockville, MD. http://www.ahrq.gov/research/findings/final-reports/ssi/ssiexh13.html