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Exhibits 29 to 31

Exhibit 29. Results of logistic regression using the 60-percent derivation set, including each of the five surgical procedures as a possible risk factor

VariableEstimatetValueProbability
Intercept-5.66922-7.183340.00000
Admission transfer0.2493580.6553730.51223
History of cancer0.6753561.2343360.21708
Chronic kidney disease-2.28736-2.240280.02507
General anesthesia0.4194251.4990210.13387
Male0.587222.6775620.00742
History of MRSA1.473314.871330.00000
Number of procedures0.3811483.1717980.00151
Postop admission2.1046249.1155230.00000
Postop hematocrit-0.04406-2.011370.04496
Preop stay0.0424371.6238370.10441
CABG surgery0.244960.7469110.45512
Herniorrhaphy0.1867620.5649690.57209
Wound class0.0030310.0148140.98818

CABG = coronary artery bypass grafting; MRSA = methicillin-resistant Staphylococcus aureus; Postop = postoperative; Preop = preoperative.

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Exhibit 30. Results of logistic regression using the 40-percent validation set, including each of the five surgical procedures as a possible risk factor

VariableEstimatetValueProbability
Intercept-5.9448-7.76060.00000
Admission transfer-0.46026-0.925130.35490
History of cancer-0.78305-0.763880.44494
Chronic kidney disease-0.49964-0.911680.36193
General anesthesia0.0467690.1712290.86404
Male-0.08612-0.39140.69550
History of MRSA1.1498533.0488320.00230
Number of procedures0.2646431.8613730.06269
Postop admission2.1152959.3485420.00000
Postop hematocrit-0.01706-0.795090.42677
Preop stay0.0358911.8142880.06963
CABG surgery0.7250952.0771660.03779
Herniorrhaphy0.5538251.7876630.07383
Wound class0.3260741.9043550.05686

CABG = coronary artery bypass grafting; MRSA = methicillin-resistant Staphylococcus aureus; Postop = postoperative; Preop = preoperative.

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Exhibit 31. Results of logistic regression using the combined derivation and validation sets, including each of the five surgical procedures as a possible risk factor

VariableEstimatetValueProbability
Intercept-5.75478-10.65870.00000
Admission transfer-0.07527-0.25258-0.25258
History of cancer0.1864840.3966760.69161
Chronic kidney disease-1.19328-2.528520.01145
General anesthesia0.2482131.2773820.20147
Male0.2543381.6587060.09718
History of MRSA1.3476075.7980360.00000
Number of procedures0.3220133.4946990.00047
Postop admission2.11117913.108890.00000
Postop hematocrit-0.03231-2.165880.03045
Preop stay0.0351452.3158320.02057
CABG surgery0.4771632.0156530.04384
Herniorrhaphy0.3768151.6739070.09415
Wound class0.169831.3001580.19355

CABG = coronary artery bypass grafting; MRSA = methicillin-resistant Staphylococcus aureus; Postop = postoperative; Preop = preoperative.

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Page last reviewed December 2012
Internet Citation: Exhibits 29 to 31. December 2012. Agency for Healthcare Research and Quality, Rockville, MD. http://www.ahrq.gov/research/findings/final-reports/ssi/ssiexh29-31.html