ORs and CIs for independent risk factors
| OR | 95% CI | |
| Age ≥75 years | 3.9 | 1.5 to 10.4 |
| ASA ≥3 | 3.9 | 1.3 to 11.5 |
| Current smoking | 7.4 | 2.6 to 21.3 |
| BMI ≥30 kg/m2 | 2.9 | 1.1 to 7.7 |
| COPD | 2.9 | 1.1 to 7.6 |
ASA, American Society of Anesthesiologists; BMI, body mass index; COPD, chronic obstructive pulmonary disease; FEV1, forced expiratory volume in 1 s; PPC, postoperative pulmonary complications; PPO, predicted postoperative.