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Exhibits 41 to 43

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

VariableEstimatetValueProbability
Intercept-5.75277-4.005410.00007
Male0.6807912.122790.03377
History of MRSA1.7524574.3142110.00002
No. of procedures0.7480744.5811060.00000
Postop admission2.2335215.9195090.00000
Preop hematocrit-0.03908-1.207970.22750

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

VariableEstimatetValueProbability
Intercept-3.80701-2.429990.01528
Male0.5589031.5184040.12891
History of MRSA1.3065382.0616060.03925
No. of procedures0.3834981.8389990.06592
Postop admission2.1663045.2289650.00000
Preop hematocrit-0.07291-1.995830.04627

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

VariableEstimatetValueProbability
Intercept-4.99176-4.533870.00001
Male0.6234332.5776260.00995
History of MRSA1.5931274.7390780.00000
No. of procedures0.5845364.7529730.00000
Postop admission2.1795047.8730710.00000
Preop hematocrit-0.05078-2.001260.04697

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

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Current as of 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