Table 1. Patient clinical characteristics.
| Characteristics | Group C (n=23) | Group O (n=23) |
|---|---|---|
| Age (years) | ||
| <65 | 10 (43.5) | 8 (34.8) |
| ≥65 | 13 (56.5) | 15 (65.2) |
| BMI (kg/m2) | ||
| <24 | 12 (52.2) | 13 (56.5) |
| ≥24 | 11 (47.8) | 10 (43.5) |
| ASA physical status | ||
| I | 2 (8.7) | 3 (13.0) |
| II | 21 (91.3) | 20 (87.0) |
| Smoking status | ||
| Never | 15 (65.3) | 14 (60.9) |
| Ever | 3 (13.0) | 4 (17.4) |
| Current | 5 (21.7) | 5 (21.7) |
| Comorbidity | ||
| Hypertension | 8 (34.8) | 6 (26.1) |
| Diabetes | 3 (13.0) | 4 (17.4) |
Data are presented as number (%). Group C, control group with a fixed PEEP of 5 cmH2O; group O, optimized PEEP group with an individualized PEEP at which SpO2 was maintained at 95–96% with minimal FiO2; BMI, body mass index; ASA, American Society of Anesthesiologists; PEEP, positive end-expiratory pressure.