| Type of surgery | n | Mechanical ventilation > 48 h | Re-intubation | Non-invasive positive pressure ventilation |
| Cardiac | 1381 | 70 | 8 | 57 |
| Thoracic | 659 | 1 | 9 | 8 |
| Open abdomen | 547 | 7 | 3 | 10 |
| Orthopaedic | 399 | 9 | 3 | 6 |
| Peripheral vascular | 352 | 2 | 1 | 5 |
| Neurological | 339 | 4 | 0 | 2 |
| Non-orthopaedic spine | 258 | 4 | 0 | 1 |
| Aortic vascular | 148 | 13 | 1 | 5 |
| Laparoscopic abdominal | 123 | 1 | 0 | 4 |
| Urological | 158 | 0 | 0 | 0 |
| Neck | 24 | 3 | 0 | 0 |
| General | 33 | 0 | 1 | 0 |
| Total (%) | 4420 | 114 (2.6) | 26 (0.6) | 98 (2.2) |