Table 1 Cohort characteristics.
| n | % | |
|---|---|---|
| Subjects by vital status | ||
| Alive at end of follow up | 1182 | 69% |
| Deceased with known cause | 515 | 30% |
| Deceased with unknown cause | 15 | 1% |
| Lost to follow up | 10 | 1% |
| Subjects by cause of leaving employment | ||
| Active at end of follow up | 408 | 24% |
| Died while active | 109 | 6% |
| Retired | 755 | 44% |
| Left for medical reasons | 269 | 16% |
| Left for other reasons | 181 | 11% |
| Total number of subjects | 1722 | 100% |
| Mean duration of follow up in years | 21.9 | |
| Number of person‐years by age | ||
| <40 years | 9875 | 26% |
| 40–49 years | 10519 | 28% |
| 50–59 years | 9573 | 25% |
| 60–69 years | 5868 | 16% |
| >70 years | 1954 | 5% |
| Total number of person‐years | 37788 | 100% |