Table 2.

Survival analysis for identifying factors affecting patients’ overall survival using a Cox proportional hazard model.

Factors	Univariable		Multivariable
	Median Survival (Months)	p	p	Hazard Ratio	95% CI
Elevated CA 19-9	52.5	0.045	0.01	24.078	2137–271,319
Intraductal and papillary variant	Not reached	0.023	0.014	0.018	0.001–0.445
N2 stage	20.2	0.036	0.027	13.882	1339–143,931
5-fluorouracil-based	53.0	0.042	0.048	5.733	1015–32,379

CI = confidence interval.