ssiexh56-58.htm

Exhibit 56. Results of logistic regression using the derivation dataset for only CABG surgeries

Variable	Estimate	tValue	Probability
Intercept	-10.72	-2.92	0.0035
Elective surgery	-1.88	-2.43	0.0150
BMI	0.12	3.21	0.0013
History of cancer	3.30	2.56	0.0104
Charlson score*	-0.63	-1.88	0.0597
Emergency surgery	-1.31	-1.45	0.1479
History of MRSA	3.02	3.57	0.0004
No. of procedures	-1.31	-1.99	0.0466
No. of surgeons*	1.07	2.14	0.0326
Postop admission	1.57	2.44	0.0149
Postop glucose*	0.01	0.96	0.3370
Postop hemoglobin	-0.33	-1.99	0.0471
Preop albumin	0.98	1.72	0.0863
Preop glucose	0.01	2.02	0.0437
Preop stay	-0.45	-1.36	0.1745

* Additional Intermountain risk factor.

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Exhibit 57. Results of logistic regression using the validation dataset for only CABG surgeries.

Variable	Estimate	tValue	Probability
Intercept	-3.96	-1.18	0.2365
Elective surgery	-0.21	-0.35	0.7255
BMI	0.09	2.55	0.0109
History of cancer@
Charlson score*	-0.33	-1.26	0.2071
Emergency surgery	1.08	1.83	0.0672
History of MRSA	0.91	0.94	0.3456
No. of procedures	-0.22	-0.46	0.6476
No. of surgeons*	0.50	0.65	0.5161
Postop admission	1.58	2.75	0.0059
Postop glucose*	0.00	-0.44	0.6635
Postop hemoglobin	-0.19	-1.35	0.1782
Preop albumin	-0.28	-0.49	0.6246
Preop glucose*	-0.01	-0.84	0.3995
Preop stay	0.12	1.68	0.0923

@ No patients in this dataset with had the specific risk factor and no probability could be calculated.
* Additional Intermountain risk factor.

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Exhibit 58. Results of logistic regression using the combined dataset for only CABG surgeries

Variable	Estimate	tValue	Probability
Intercept	-7.42	-3.28	0.0011
Elective surgery	-0.53	-1.18	0.2365
BMI	0.10	4.19	0.0000
History of cancer	1.60	1.71	0.0875
Charlson score*	-0.45	-2.48	0.0132
Emergency surgery	0.14	0.31	0.7555
History of MRSA	1.90	3.37	0.0008
No. of procedures	-0.65	-1.68	0.0920
No. of surgeons*	0.68	1.73	0.0831
Postop admission	1.50	3.71	0.0002
Postop glucose*	0.00	0.53	0.5975
Postop hemoglobin	-0.24	-2.35	0.0186
Preop albumin	0.28	0.72	0.4716
Preop glucose*	0.00	0.44	0.6570
Preop stay	0.10	1.37	0.1712

* Additional Intermountain risk factor.

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Current as of December 2012

Internet Citation: ssiexh56-58.htm. December 2012. Agency for Healthcare Research and Quality, Rockville, MD. http://www.ahrq.gov/research/findings/final-reports/ssi/ssiexh56-58.html