ssiexh68-70.htm

Exhibit 68. Results of logistic regression using the derivation dataset for only appendectomy surgeries

Variable	Estimate	tValue	Probability
Intercept	-2.31	-0.88	0.3806
Age	0.01	1.12	0.2634
Charlson score*	0.20	1.96	0.0496
Diabetes	-1.07	-1.12	0.2646
General anesthesia	-1.25	-0.82	0.4100
History of MRSA	1.51	1.32	0.1860
Postop admission	2.21	4.56	0.0000
Postop hematocrit	-0.14	-2.00	0.0478
Postop hemoglobin	0.27	1.02	0.3178
Preop glucose*	0.01	0.99	0.3222
Preop hemoglobin	-0.16	-0.68	0.5045

*Additional Intermountain risk factor.

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Exhibit 69. Results of logistic regression using the validation dataset for only appendectomy surgeries.

Variable	Estimate	tValue	Probability
Intercept	-4.95	-1.27	0.2050
Age	-0.01	-0.21	0.8311
Charleson score*	-0.32	-0.78	0.4367
Diabetes	1.90	1.24	0.2134
General anesthesia@
History of MRSA@
Postop admission	2.40	2.92	0.0035
Postop hematocrit	-0.28	-2.09	0.0392
Postop hemoglobin	0.84	2.06	0.0434
Preop glucose*	-0.01	-0.92	0.3632
Preop hemoglobin	-0.09	-0.31	0.7564

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

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Exhibit 70. Results of logistic regression using the combined dataset for only appendectomy surgeries

Variable	Estimate	tValue	Probability
Intercept	-3.34	-1.48	0.1399
Age	0.01	1.01	0.3142
Charlson score*	0.16	1.65	0.0995
Diabetes	-0.62	-0.79	0.4299
General anesthesia	-1.72	-1.33	0.1823
History of MRSA	0.97	0.89	0.3710
Postop admission	2.27	5.43	0.0000
Postop hematocrit	-0.13	-2.24	0.0263
Postop hemoglobin	0.40	2.15	0.0317
Preop glucose*	0.00	0.65	0.5150
Preop hemoglobin	-0.16	-0.97	0.3379

*Additional Intermountain risk factor.

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Current as of December 2012

Internet Citation: ssiexh68-70.htm. December 2012. Agency for Healthcare Research and Quality, Rockville, MD. http://www.ahrq.gov/research/findings/final-reports/ssi/ssiexh68-70.html