Table 4.

Results of Cox multivariate regression analysis

Variable	Parameter estimate	Wald χ2	P	Hazard ratio	95%CI
Tumor node metastasis staging		20.559	< 0.001
0-II				1.000
III	-3.112	19.846	< 0.001	0.045	0.011-0.175
IV	-1.044	9.341	0.002	0.352	0.180-0.688
Lymph node ratio	2.424	20.247	< 0.001	11.293	3.929-32.465
Total lymph node count	-0.147	14.273	< 0.001	0.864	0.800-0.932
Histological grade	-0.755	5.512	0.019	0.470	0.250-0.883