| Variable | Frequency (%) |
| Age (years) |
|
| 30 - 40 | 2 (6.25) |
| 41 - 50 | 6 (18.75) |
| 51 - 60 | 8 (25.00) |
| 61 - 70 | 12 (37.5) |
| >70 | 4 (12.5) |
| Sex |
|
| Male | 25 (78.13) |
| Female | 7 (21.87) |
| Smoking |
|
| Yes | 10 (31.25) |
| No | 22 (68.75) |
| Age at onset of smoking |
|
| ≥20 | 5 (50) |
| <20 | 5 (50) |
| Tobacco consumption (Pack-years) |
|
| ≥25 | 5 (50) |
| <25 | 5 (50) |
| Professional exposure |
|
| Yes | 8 (25.00) |
| No | 24 (75.00) |
| Residential exposure |
|
| Yes | 2 (6.25) |
| No | 30 (93.75) |