Table II.

Cox proportional hazard ratio model showed that adjuvant chemotherapy was an independent prognostic factor in patients with preoperative FEV1 ≥21.

Variable	Hazard ratio	95% confidence interval	P-value
Adjuvant chemotherapy (yes/no)	0.49	0.28–0.86	0.012
P-stage (IB/II, IIIA)	0.33	0.15–0.70	0.004
Age, years (<65/≥65)			0.265
Gender (male/female)			0.776
Pneumonectomy (left/right)			0.209

FEV1, forced expiratory volume in 1 sec.