Table 7.

Regression analysis of multivariate Cox model for overall survival in patients with esophageal squamous cell carcinoma in group A.

Variable	Hazard ratio	95% Confidence interval	I value
Tumor size	1.30	0.68–2.49	0.43
T stage	2.12	1.41–3.20	<0.001
N stage	1.83	0.88–3.83	0.11
TNM staging	0.70	0.35–1.37	0.70
Vascular tumor invasion	2.00	0.74–5.26	0.18