Response rates, time of follow up, crude and age standardised incidences for occupational mobility, early retirement due to permanent disability, and total mortality in the follow up period
| Occupational mobility | Early retirement (permanent disability) | Total mortality | |
| People examined at baseline (1986–8) (n) | 10809 | 10809 | 10809 |
| People followed up (1992–4) | 10668 | 9972 | 10429 |
| Proportion of people followed up | 98.7% | 92.3% | 96.5% |
| Total person-years | 45785 | 45136 | 49585 |
| Mean duration of follow up (y) | 4.3 | 4.5 | 4.8 |
| Events (n) | 2427 | 359 | 188 |
| Incidence/100000 p-y (95% CI) | 5301 (5090 to 5512) | 795 (713 to 878) | 379 (325 to 433) |