Table 4.

Logistic regression analysis on the risk factors for DR in patients who underwent radical biliary surgery.

Variables	β	SE	OR	95% CI	P
Age ≥70 yr	0.185	0.202	1.454	1.146∼1.904)	.048
BMI ≥25 kg/m2	0.122	0.319	1.303	1.102∼1.912	.037
Alcohol drinking	0.119	0.121	2.041	1.336∼3.085	.042
Smoking	0.176	0.114	1.128	1.007∼2.261	.018
Duration of surgery ≥220 min	0.105	0.103	1.239	1.039∼1.735	.011
Duration of anesthesia ≥230 min	0.173	0.110	1.223	1.013∼1.926	.015
Intraoperative combined sevoflurane inhalation	0.118	0.106	1.207	1.008∼1.764	.043