ssiexh41-43.htm

Exhibit 41. Results of logistic regression using the derivation dataset for only total knee surgery

Variable	Estimate	tValue	Probability
Intercept	-5.75277	-4.00541	0.00007
Male	0.680791	2.12279	0.03377
History of MRSA	1.752457	4.314211	0.00002
No. of procedures	0.748074	4.581106	0.00000
Postop admission	2.233521	5.919509	0.00000
Preop hematocrit	-0.03908	-1.20797	0.22750

MRSA = methicillin-resistant Staphlococcus aureus; Postop = postoperative; Preop = preoperative.

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Exhibit 42. Results of logistic regression using the validation dataset for only total knee surgery

Variable	Estimate	tValue	Probability
Intercept	-3.80701	-2.42999	0.01528
Male	0.558903	1.518404	0.12891
History of MRSA	1.306538	2.061606	0.03925
No. of procedures	0.383498	1.838999	0.06592
Postop admission	2.166304	5.228965	0.00000
Preop hematocrit	-0.07291	-1.99583	0.04627

MRSA = methicillin-resistant Staphlococcus aureus; Postop = postoperative; Preop = preoperative.

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Exhibit 43. Results of logistic regression using the combined dataset for only total knee surgery

Variable	Estimate	tValue	Probability
Intercept	-4.99176	-4.53387	0.00001
Male	0.623433	2.577626	0.00995
History of MRSA	1.593127	4.739078	0.00000
No. of procedures	0.584536	4.752973	0.00000
Postop admission	2.179504	7.873071	0.00000
Preop hematocrit	-0.05078	-2.00126	0.04697

MRSA = methicillin-resistant Staphlococcus aureus; Postop = postoperative; Preop = preoperative.

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Current as of December 2012

Internet Citation: ssiexh41-43.htm. December 2012. Agency for Healthcare Research and Quality, Rockville, MD. http://www.ahrq.gov/research/findings/final-reports/ssi/ssiexh41-43.html