Table 3.

Multivariate regression models (10th decile of patients excluded)

Variable	OR	Confidence limits*	p value
(a) Laparoscopic Roux-en-Y gastric bypassa
Operative time	1.005	(1.003, 1.006)	\0.001
Age (yr)	1.013	(1.006, 1.019)	\0.001
Dialysis	10.047	(2.807, 35.958)	\0.001
BMI	1.012	(1.005, 1.02)	0.002
CHF	12.8	(1.778, 92.164)	0.011
Hypertension	1.181	(1.024,1.362)	0.023
(b) Laparoscopic colectomyb
Operative time	1.004	(1.003, 1.005)	\0.001
ASA	1.421	(1.237, 1.632)	\0.001
Smoking	1.357	(1.156, 1.594)	\0.001
Dyspnea	1.323	(1.058, 1.655)	0.014
BMI	1.011	(1.001, 1.021)	0.025
Hypertension	1.157	(1.014, 1.32)	0.030
(c) Laparoscopic cholecystectomyc
Operative time	1.011	(1.008, 1.014)	\0.001
Age (yr)	1.013	(1.009, 1.018)	\0.001
ASA	1.342	(1.130, 1.594)	0.001
BMI	1.015	(1.007, 1.024)	0.001
CHF	3.849	(1.137, 13.036)	0.03
(d) Laparoscopic Nissen fundoplicationd
Operative time	1.007	(1.003, 1.011)	0.001
Age (yr)	1.028	(1.016, 1.04)	\0.001
(e) Laparoscopic inguinal herniae
Operative time	1.009	(0.997, 1.019)	0.059
Age (yr)	1.021	(1.007, 1.036)	0.004
Sex	0.45	(0.246, 0.822)	0.009
PVD	4.581	(1.03, 20.384)	0.046

^ac-index = 0.604, n = 16,129. Hosmer-Lemeshow p = 0.486

^bc-index = 0.594, n = 9,168. Hosmer-Lemeshow p = 0.409

^cc-index = 0.614, n = 34,531. Hosmer-Lemeshow p = 0.41

^dc-index = 0.638, n = 4,934. Hosmer-Lemeshow p = 0.159

^ec-index = 0.641, n = 5,780. Hosmer-Lemeshow p = 0.0017

^*95% Wald confidence limits.

BMI body mass index; ASA American Society of Anesthesiologists Classification (3 vs. 1 or 2); CHF congestive heart failure; PVD peripheral vascular disease