Outcomes and prognostic factors of patients with stage IB and IIA pancreatic cancer according to the 8th edition American Joint Committee on Cancer criteria

Table 3 Prognostic significance for overall survival by multivariate analysis of variables for stage IB and IIA patients¹

Variable	Stage IB			Stage IIA
	RR	95%CI	P value	RR	95%CI	P value
Age	1.037	1.025-1.049	0.000	1.045	1.029-1.062	0.000
Gender (male vs female)	1.128	0.887-1.434	0.327	1.235	0.852-1.790	0.265
Tumor size	1.018	0.996-1.039	0.000	1.003	0.999-1.008	0.173
Primary site (head vs body-tail)	1.734	1.311-2.294	0.000	1.197	0.825-1.736	0.345
Grade (I + II vs III + IV)	0.570	0.443-0.734	0.104	0.490	0.333-0.721	0.000

¹Multivariate analysis was done with Cox proportional hazard regression model.