Version June 2024
| Factor | Adjusted odds ratio (95% CI) | Risk score |
| Age, years | ||
| ≤50 | 1 | |
| 51-80 | 1.4 (0.6-3.3) | 3 |
| >80 | 5.1 (1.9-13.3) | 16 |
| Preoperative O2 saturation | ||
| ≥96 percent | 1 | |
| 91-95 percent | 2.2 (1.2-4.2) | 8 |
| ≤90 percent | 10.7 (4.1-28.1) | 24 |
| Respiratory infection in the last month | 5.5 (2.6-11.5) | 17 |
| Preoperative anemia - hemoglobin ≤10 g/dL | 3 (1.4-6.5) | 11 |
| Surgical incision | ||
| Upper abdominal | 4.4 (2.3-8.5) | 15 |
| Intrathoracic | 11.4 (1.9-26.0) | 24 |
| Duration of surgery | ||
| ≤2 hours | 1 | |
| 2-3 hours | 4.9 (2.4-10.1) | 16 |
| >3 hours | 9.7 (2.4-19.9) | 23 |
| Emergency surgery | 2.2 (1.0-4.5) | 8 |
| Risk class | Number of points in risk score | Pulmonary complication rate (validation sample) |
| Low | <26 points | 1.6 percent |
| Intermediate | 26-44 points | 13.3 percent |
| High | ≥45 points | 42.1 percent |
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