Distribution of potential confounding variables across cases and controls
| Characteristic | Cases(n = 204) | Controls(n = 339) |
|---|---|---|
| Mean (SD) age | 64.8 (9.6) | 65.7 (9.4) |
| Median (IQR) Townsend score (current address) | 1.2(−2.2 to 4.7) | −1.9(−3.6 to −2.4) |
| Currently married or co-habiting (%) | 54.4 | 68.7 |
| Last main job = manual social class (%) | 64.2 | 41.9 |
| Current tenure = rented (%) | 44.1 | 18.6 |
| Current car owner (%) | 42.2 | 66.3 |
| Active smoking status (%) | ||
| Current | 59.3 | 14.7 |
| Ex-smoker | 37.8 | 36.5 |
| Never smoker | 3.0 | 48.7 |
| Regular exposure to passive smoking in any setting for >30 years over lifetime (%) | 96.1 | 87.9 |
| Possible or probable exposure to asbestos ever (%) | 17.2 | 9.1 |
| Possible or probable exposure to other lung cancer occupational exposures ever (%) | 27.0 | 14.9 |