Table 4. Results of a univariate analysis for predictors of postoperative complications after simultaneous and staged bilateral VATS lobectomy.

Characteristics	Simultaneous bilateral lobectomy resection				Staged bilateral lobectomy resection
	Complications (n=11)	Non-complications (n=30)	P value		Complications (n=16)	Non-complications (n=50)	P value
Gender (male vs. female)	5/6	11/19	0.881		5/11	30/20	0.045
Age (<60 vs. ≥60 years)	8/3	17/13	0.575		6/10	23/27	0.551
Smoking (yes vs. no)	2/9	2/28	0.289		2/14	13/37	0.436
Preoperative comorbidities (yes vs. no)	6/5	3/27	0.009		4/12	7/43	0.521
FEV1 (<2 vs. ≥2 L)	6/5	1/29	0.001		2/14	11/39	0.638
FEV1% (<80% vs. ≥80%)	5/6	3/27	0.036		4/12	10/40	0.941
Number of segments (≥9 vs. <9)	5/6	2/28	0.014		9/7	8/42	0.004

VATS, video-assisted thoracic surgery; FEV₁, the forced expiratory volume in 1 s; FEV₁%, percent of the predicted FEV₁.