Table 2.

Cox regression analysis of baseline variables from two cohorts for overall survival.

	Univariable analysis		Multivariable analysis
Characteristics	HR (95% CI)	P a	HR (95% CI)	P a
Sex (male vs. female)	1.106 (0.673–1.819)	0.691
Age (≥60 vs. <60)	1.224 (0.769–1.950)	0.394
Clinical T stage (≥T3 vs. <T3)	0.848 (0.516–1.395)	0.516	1.210 (0.709–2.063)	0.485
Clinical N stage (N+ vs. N0)	2.102 (1.237–3.572)	0.006	2.233 (1.262–3.952)	0.006
Group (nonradio vs. radio)	1.382 (0.810–2.359)	0.235	1.289 (0.754–2.205)	0.354
Adjuvant chemotherapy (yes vs. non)	2.391 (0.751–7.610)	0.140
Smoking status (current/former vs. never)	1.254 (0.797–1.972)	0.327
Alcohol use (positive vs. negative)	1.031 (0.650–1.637)	0.896

^a P values from univariable and multivariable Cox regression models. HR, hazard ratio