| βcoefficient | Score * |
---|---|---|
Age (years) | ||
 ≤ 50 | 0 | 0 |
 51–80 | 0.331 | 3 |
 > 80 | 1.619 | 16 |
Preoperative SpO2 (%) | ||
 ≥ 96 | 0 | 0 |
 91–95 | 0.802 | 8 |
 ≤ 90 | 2.375 | 24 |
Respiratory infection in the last month | ||
 No | 0 | 0 |
 Yes | 1.698 | 17 |
Preoperative anemia (Hb ≤10 g/dl) | ||
 No | 0 | 0 |
 Yes | 1.105 | 11 |
Surgical incision | ||
 Peripheral | 1.480 | 15 |
 Upper abdominal | 2.431 | 24 |
 Intrathoracic |  |  |
Duration of surgery (h) | ||
 ≤ 2 | 1.593 | 0 |
 2–3 | 2.268 | 16 |
 > 3 | 0.768 | 23 |
Emergency procedure | ||
 No | 0 | 0 |
 Yes | 0.768 | 8 |