Metformin Use and Survival in Patients with Advanced Extrahepatic Cholangiocarcinoma: A Single-Center Cohort Study in Fuyang, China

Table 3

ORs and 95% CIs for metformin use in study group.

Characteristic			OR (95% CI)	value
	Age at first metformin use (y)
<60	40	19	0.990 (0.476–2.057)	0.978
≥60	50	24
Before or after EHCC use
Before	0	6	3.432 (2.617–4.502)	0.001
After	90	37
Duration of use (mon)
<3	37	29	2.967 (1.383–6.368)	0.005
≥3	53	14

: number; y: year; d: day; mon: month.