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

Exhibits 41 to 43

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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Page last reviewed December 2012
Internet Citation: Exhibits 41 to 43. December 2012. Agency for Healthcare Research and Quality, Rockville, MD. http://www.ahrq.gov/research/findings/final-reports/ssi/ssiexh41-43.html