Table 3. Multivariate analysis by Cox for DFS.

Variables	β	SE (β)	Wald χ2	P	RR	95%CI for RR
N stage	0.514	0.115	19.855	<0.0001	1.672	(1.334, 2.097)
CEA	0.594	0.192	9.591	0.02	1.812	(1.244, 2.639)