Smoking history of cases and controls
| Cases (n = 247) | Controls (n = 795) | ||
|---|---|---|---|
| Non-smokers | 7 (2.8%) | 25 (3.1%) | |
| Current smokers | 136 (55.1%) | 342 (43.0%) | |
| ⩽10 cig/day | 24 (17.6%) | 116 (33.9%) | |
| >10 cig/day | 112 (82.4%) | 226 (66.1%) | |
| Ex-smokers | 99 (40.1%) | 424 (53.3%) | |
| Missing information | 5 (2.0%) | 4 (0.5%) | |
| Time since cessation (years) median (min-max) | 4 (1–44) | 14 (1–51) |