Table 3. Univariate analysis: risk factors for postoperative respiratory-related complications.

	Factors		OR	95% CI	p
Age	≤59 yr	60–69 yr	2.941	1.523–5.683	0.0013
		70–79 yr	3.839	2.002–7.358	<0.0001
		80 yr ≤	4.780	2.387–9.562	<0.0001
Sex	Female	Male	2.997	2.099–4.283	<0.0001
Surgical procedure	VATS	Thoracotomy	1.498	0.717–3.130	0.2822
%FEV1	80% ≤	<80%	2.191	1.538–3.126	<0.0001
FEV1/FVC	70% ≤	<70%	2.219	1.597–2.841	<0.0001
BMI	Normal	Low (<18.5 kg/m2)	1.699	1.128–2.560	0.0112
		High (25 kg/m2 ≤)	0.696	0.474–1.022	0.0639
Intraoperative bleeding volume	<110 g	110 g ≤	2.475	1.833–3.340	<0.0001
Operation time	<120 min	120 min ≤	2.039	1.535–2.711	<0.0001
Smoking status	Never	Current (<2 mo)	2.838	1.869–4.308	<0.0001
		Ex (2 mo ≤)	3.096	2.104–4.555	<0.0001
Smoking volume (pack-years)	0	1–9	1.711	0.674–4.341	0.2579
		10–29	2.178	1.261–3.765	0.0052
		30 ≤	3.257	2.245–4.728	<0.0001
Smoking cessation period	Current (<2 mo)	2 mo–10 yr	1.194	0.663–1.419	0.8790
		10 yr ≤	0.970	0.810–1.760	0.3609

BMI: body mass index; CI: confidence interval; %FEV1: percentage of predicted forced expiratory volume in one second; FEV1/FVC: forced expiratory volume in one second divided by forced vital capacity; mo: months; OR: odd ratio; VATS: videoassisted thoracoscopic surgery; yr: years