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| Malignant group | Benign group | |
|---|---|---|
| Age, years | 60.2 ± 1.3 | 56.9 ± 1.4 |
| Gender | ||
| Male | 38 | 17 |
| Female | 10 | 22 |
| Smoking status | ||
| Smokers | 25 | 14 |
| Non-smokers | 23 | 25 |
| Pack/years | 60.1 ± 8.0 | 38.9 ± 5.9 |
| Histological type | ||
| Squamous cell carcinoma | 19 | |
| Adenocarcinoma | 15 | |
| Small-cell lung cancer | 11 | |
| Others | 3 |
