Right versus left transthoracic approach for lymph node-negative esophageal squamous cell carcinoma

Table 3 Possible prognostic factors and relative risks

Possible prognostic factors	P	Hazard ratio	95 % Confidence interval
Age	0.003	1.108	1.006–1.030
Smoking history	<0.001	1.601	1.273–2.014
Drinking history	<0.001	1.687	1.321–2.155
Duration of surgery	0.039	1.002	1.000–1.003
Blood loss during surgery	0.140	1.001	1.000–1.001
Tumor staging	<0.001	1.470	1.231–1.755
Tumor location	0.249	0.887	0.724–1.087
Operation approach	0.019	1.101	1.016–1.193
Location of anastomosis	0.081	0.808	0.635–1.026
Method of anastomosis	0.731	0.955	0.733–1.244
Complications	0.132	0.812	0.619–1.065

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