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Patient demographics
| Category | Patients, n (%) |
|---|---|
| Age, median (range) | 61 (32–78) |
| >61 years | 94 (47.0) |
| ≤61 years | 106 (53.0) |
| Sex | |
| Male | 76 (38.0) |
| Female | 124 (62.0) |
| Smoking | |
| Ever | 99 (50.5) |
| Never | 101 (49.5) |
| Tumor location | |
| Left | 75 (37.5) |
| Right | 125 (62.5) |
| Pathological stage | |
| I–II | 87 (43.5) |
| III–IV | 113 (56.5) |
