ssiexh35-37.htm

Exhibit 35. Results of logistic regression using the derivation dataset for only herniorrhaphy

Variable	Estimate	tValue	Probability
Intercept	-7.19702	-2.90005	0.00378
No. of procedures	-1.22262	-1.19116	0.23359
Postop admission	2.105654	3.434398	0.00059
Postop hematocrit	-0.15235	-2.04515	0.04164
Postop hemoglobin	0.558391	2.282273	0.02329
Longer preoperative stay	0.119229	1.583554	0.11330
History of rheumatism	1.80024	1.428812	0.15310
Wound class	0.812588	1.409284	0.15876

Postop = postoperative; Preop = preoperative.

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Exhibit 36. Results of logistic regression using the validation dataset for only herniorrhaphy

Variable	Estimate	tValue	Probability
Intercept	-6.63084	-3.1182	0.00195
No. of procedures	0.389846	1.706724	0.08789
Postop admission	3.430942	5.136659	0.00000
Postop hematocrit	0.132635	1.271441	0.20613
Postop hemoglobin	-0.42173	-1.32403	0.18974
Longer preoperative stay	0.006993	0.13405	0.89336
History of rheumatism	0.632211	0.536855	0.59137
Wound class	0.407113	0.76837	0.44228

Postop = postoperative; Preop = preoperative.

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Exhibit 37. Results of logistic regression using the combined dataset for only herniorrhaphy

Variable	Estimate	tValue	Probability
Intercept	-6.53827	-4.0998	0.00007
No. of procedures	0.174594	0.920322	0.35743
Postop admission	2.787336	6.551838	0.00000
Postop hematocrit	-0.03547	-0.44784	0.66071
Postop hemoglobin	0.082922	0.331393	0.74535
Longer preoperative stay	0.036602	1.854843	0.06362
History of rheumatism	1.226935	1.51136	0.13070
Wound class	0.490776	1.44229	0.14923

Postop = postoperative; Preop = preoperative.

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Current as of December 2012

Internet Citation: ssiexh35-37.htm. December 2012. Agency for Healthcare Research and Quality, Rockville, MD. http://www.ahrq.gov/research/findings/final-reports/ssi/ssiexh35-37.html