Population demographic and clinical data
| Age years | 69 (62–77) |
| Male sex | 177 (53.5%) |
| Smoking status: smoker | 172 (52.0%) |
| Smoking status: ex-smoker | 138 (41.7%) |
| Smoking status: never-smoker | 21 (6.3%) |
| Smoking history (for smokers/ex-smokers) pack-years | 36 (23–50) |
| Asbestos exposure | 77 (23.3%) |
| Personal history of cancer | 56 (16.9%) |
| Family history of lung cancer | 58 (17.5%) |
| Body mass index kg·m−2 | 25 (22.1–28.4) |
| Education level: less than high school graduate | 283 (85.5%) |
| Ethnicity: white | 322 (97.3%) |
| Ethnicity: Asian | 5 (1.5%) |
| Ethnicity: black | 3 (0.9%) |
| Ethnicity: Hispanic | 1 (0.3%) |
Data are presented as medians with interquartile ranges or n (%).