Variables (category) evaluated for morbidity
| Preoperative general factors (12 variables) |
| Age |
| Sex |
| Brinkmann index |
| Serum total protein |
| Serum albumin |
| Serum LDH |
| %FVC |
| %FEV1 |
| FEV1(%) |
| RV/TLC |
| Pao 2 |
| Paco 2 |
| Surgical factors (three variables) |
| Operative procedure |
| Operated site |
| Existence of adhesion at operation |
| Oncological factors (four variables) |
| Pathological T stage |
| Pathological N stage |
| Pathological stage |
| Histological type |
LDH = lactate dehydrogenase; FVC = forced vital capacity; FEV1 = forced expiratory volume in one second; RV = residual volume; TLC = total lung capacity; Pao 2, Paco 2 = arterial oxygen and carbon dioxide tensions.