Table 3.

Multiple stepwise regression analysis with the Cox proportional hazards model

Characteristics	B	SE	Wald	P value	RR	95%CI
Depth of invasion			23.143	0.000
pT3/pT2	0.604	0.228	7.032	0.008	1.829	1.171	2.857
pT4a/pT2	0.775	0.161	23.135	0.000	2.171	1.583	2.977
Lymph node metastasis			9.923	0.019
pN1/pN0	0.578	0.280	4.268	0.039	1.783	1.030	3.085
pN2/pN0	1.130	0.420	7.224	0.007	3.095	1.358	7.055
pN3/pN0	1.601	0.528	9.204	0.002	4.959	1.763	13.954
MLR	0.061	0.170	0.130	0.719	1.063	0.762	1.483
Tumor size (cm)	0.762	0.123	38.524	0.000	2.143	1.684	2.726

MLR: Metastatic lymph node ratio; CI: Confidence interval; RR: Relative risk; B: Borrmann.