Table 3. Predictive factors for postoperative air leakage.

Variable	After propensity score matching
	OR	95% CI	P
Age (≥70 years)	0.74	0.19–2.51	0.639
Gender (male)	2.04	0.45–9.76	0.353
Height (≥160 cm)	1.77	0.11–1.87	0.281
Brinkman Index (≥400)	0.47	0.11–1.87	0.281
COPD (presence)	2.86	0.73–10.43	0.128
Performance status (≥1)	1.20	0.01–4.43	0.538
Tumor size (≥15 mm)	0.86	0.25–3.16	0.808
Stapler	8.58	2.25–56.50	<0.001

OR, odds ratio; CI, confidence interval; COPD, chronic obstructive pulmonary disease.