ssiexh32-34.htm

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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Current as of December 2012

Internet Citation: ssiexh32-34.htm. December 2012. Agency for Healthcare Research and Quality, Rockville, MD. http://www.ahrq.gov/research/findings/final-reports/ssi/ssiexh32-34.html