Table 5. Multivariate analysis of patients by Cox model.

Variable	χ2	P vale	RR	95% CI
Sex	0.0.173	0.678	0.936	0.684–1.280
Age	0.035	0.851	1.034	0.726–1.473
Tumor size	4.962	0.026	1.574	1.056–2.347
Tumor location	5.906	0.015	0.819	0.697–0.962
Depth of invasion	0.815	0.367	1.148	0.851–1.548
Lymph node status	1.886	0.170	1.443	0.855–2.435
Curability	18.278	0.000	2.719	1.719–4.301
Pathological stage	8.273	0.004	1.396	1.112–1.753