Table 3a. COX Proportional Hazard Model for Survival Analysis in Overall Population (N=221).

Variable	HR	95%CI	P–value
Never-smoker/Ever-smoker	0.413	0.294–0.582	<0.001
Adeno/Non-adeno	0.416	0.265–0.654	<0.001
PS 0, 1/2–4	0.205	0.145–0.291	<0.001

Stepwise method (include <0.05, exclude >0.2).

Tested variables; gender, smoking, histology, PS, excluded variable; gender.