Descriptive statistics of the study groups
| Variable | Controls | Exposed | ||
| n | 22 | 13 | ||
| Age (y, median (range)) | 34 (22–53) | 31 (24–51) | ||
| Body mass (kg, median (range)) | 89 (62–108) | 83 (75–100) | ||
| Height (m, median (range)) | 1.80 (1.65–1.95) | 1.85 (1.70–1.94) | ||
| Employment (y, median (range)) | 14 (1–33) | 11 (2–31) | ||
| Smoking behaviour (cigarettes/day, n (%)): | ||||
| 0 | 8 | 36 | 6 | 46 |
| <10 | 3 | 14 | 0 | 0 |
| 10–20 | 9 | 41 | 7 | 54 |
| >20 | 2 | 9 | 0 | 0 |
| Alcohol consumption (g/day, n (%)): | ||||
| 0 | 3 | 14 | 2 | 15 |
| <20 | 16 | 72 | 10 | 77 |
| 20–50 | 3 | 14 | 1 | 8 |