| Charlson co-morbidity index (%) | ||||
| 0 | 1–2 | 3–4 | 5+ | |
| Lobectomy | 506 (47.8) | 471 (44.5) | 71 (6.7) | 10 (0.9) |
| Bilobectomy | 93 (53.8) | 71 (41.0) | 8 (4.6) | 1 (0.6) |
| Pneumonectomy | 298 (58.9) | 190 (37.5) | 17 (3.4) | 1 (0.2) |
| Sublobar resection | 48 (44.9) | 47 (43.9) | 11 (10.3) | 1 (0.9) |
| Total | 945 (51.2) | 779 (42.2) | 107 (5.8) | 13 (0.7) |