Clinicopathological characteristics of the patients
| Sex | |
| Male | 239 (92%) |
| Female | 22 (8%) |
| Age | |
| < 60 years | 95 (36%) |
| ≥ 60 years | 166 (64%) |
| Histology | |
| Total | 261 |
| Squamous cell carcinoma | 163 (63%) |
| Adenocarcinoma | 68 (26%) |
| Anaplastic/large cell carcinoma | 30 (11%) |
| Histological grade | |
| Grade I | 18 (7%) |
| Grade II | 106 (41%) |
| Grade III | 95 (36%) |
| Not assessed (anaplastic/large cell carcinoma) | 30 (12%) |
| Data missing | 12 (4%) |
| Karnofsky scale | |
| < 70 | 17 (7%) |
| ≥ 70 or more | 236 (90%) |
| Not known | 8 (3%) |
| Stage | |
| Stage I | 166 (64%) |
| Stages II–IV | 89 (34%) |
| Not assessed | 6 (2%) |
| Smoker | |
| Yes | 219 (84%) |
| No | 5 (2%) |
| Data missing | 35 (14%) |
| Recurrence during the follow up | |
| Yes | 124 (48%) |
| No | 137 (52%) |
| Type of operation | |
| Radical pulmectomy/lobectomy | 222 (85%) |
| Palliative pulmectomy/lobectomy | 26 (10%) |
| Explorative thoracotomy | 13 (5%) |