Table 1: Characteristics of inception cohort of 1369 coal miners.
| N (%) | mean | sd | median | min | max | |
| Age at entry to FU (yrs) | 1369 | 19.3 | 4.4 | 18 | 16 | 48 |
| Age at end of FU (yrs) | 1369 | 40.7 | 8.6 | 44 | 20 | 60 |
| Duration of FU (yrs) | 1369 | 21.4 | 8.2 | 25 | 3 | 32 |
| BMI at entry | 1369 | 22.6 | 3.1 | 22 | 16.3 | 43.6 |
| BMI at end of FU | 1369 | 27.2 | 4.6 | 28.8 | 16.4 | 67.8 |
| Smoking status at entry of FU | Pack-years | |||||
| Current smoker, N (%) | 365 (27) | 3 | 3.2 | 2 | 0.1 | 28 |
| Former smoker, N (%) | 5 (0.4) | 5.1 | 5 | 3.75 | 0.5 | 13.5 |
| Never smoker, N (%) | 999 (73) | 0 | 0 | 0 | 0 | 0 |
| Smoking status at end of FU | Pack-years | |||||
| Current smoker, N (%) | 394 (29) | 17.4 | 9.9 | 16 | 0.6 | 54.4 |
| Former smoker, N (%) | 603 (44) | 12.9 | 9.8 | 11.1 | 0.1 | 84 |
| Never smoker, N (%) | 372 (27) | 0 | 0 | 0 | 0 | 0 |
| Nationality | ||||||
| German, N (%) | 1168 (85) | |||||
| Other, N (%) | 201 (15) |
FU: Follow-up; sd: Standard deviation; min: Minimum; max: Maximum.