Table 2. Logistic regression analysis of baseline data of VATS and TT groups.

Variable	Coef	td. Err	P>|z|	95% CI
Smoke	−0.36	0.21	0.04	−0.77 to 0.05
Age	0.00	0.01	0.98	−0.20 to 0.21
Sex	−0.07	0.32	0.73	−0.45 to 0.30
Tumor size (cm)	−0.37	0.07	0.00	−0.51 to 0.24
cN2	0.60	0.30	0.04	0.01 to 1.18
FEV1	0.01	0.01	0.91	−0.15 to 0.14
MVV	0.01	0.01	0.20	−0.01 to 0.02

VATS, video-assisted thoracoscopic surgery; TT, traditional thoracotomy; CI, confidence interval; FEV, forced expiratory volume; MVV, maximum ventilatory volume.