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

Exhibits 32 to 34

Exhibit 32. Results of logistic regression using the derivation dataset for only CABG surgeries.

Variable Estimate tValue Probability
Intercept -10.9133 -4.25511 0.00002
Transfer admission 1.285104 2.234972 0.02542
BMI 0.111739 3.758852 0.00017
History of MRSA 2.214599 3.213444 0.00131
Postop admission 2.03457 3.397303 0.00068
Preop hematocrit 0.145933 1.881071 0.06342
Preop hemoglob -0.1963 -0.86847 0.39360
Surgery duration -0.00573 -2.02865 0.04249

BMI = body mass index; MRSA = methicillin-resistant Staphylococcus aureus; Postop = postoperative; Preop = preoperative.

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Exhibit 33. Results of logistic regression using the validation dataset for only CABG surgeries.

Variable Estimate tValue Probability
Intercept -4.41194 -2.00311 0.04533
Transfer admission -0.36612 -0.46516 0.64182
BMI 0.087611 2.610583 0.00904
History of MRSA 1.072824 1.320566 0.18665
Postop admission 0.646026 1.244747 0.21324
Preop hematocrit 0.027258 0.274814 0.78942
Preop hemoglob -0.20223 -0.70553 0.50265
Surgery duration -0.00372 -1.3105 0.19003

BMI = body mass index; MRSA = methicillin-resistant Staphylococcus aureus; Postop = postoperative; Preop = preoperative.

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Exhibit 34. Results of logistic regression using the combined dataset for only CABG surgeries

Variable Estimate tValue Probability
Intercept -7.01035 -4.29561 0.00002
Transfer admission 0.616473 1.420047 0.15560
BMI 0.095185 4.350031 0.00001
History of MRSA 1.565599 3.098649 0.00195
Postop admission 1.267214 3.445955 0.00057
Preop hematocrit 0.087034 1.579951 0.12344
Preop hemoglob -0.22319 -1.51617 0.14453
Surgery duration -0.00477 -2.36402 0.01809

BMI = body mass index; MRSA = methicillin-resistant Staphylococcus aureus; Postop = postoperative; Preop = preoperative.

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Page last reviewed December 2012
Page originally created December 2012
Internet Citation: Exhibits 32 to 34. Content last reviewed December 2012. Agency for Healthcare Research and Quality, Rockville, MD. http://www.ahrq.gov/research/findings/final-reports/ssi/ssiexh32-34.html