Table 1

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)108091080910809
People followed up (1992–4)10668997210429
Proportion of people followed up98.7%92.3%96.5%
Total person-years457854513649585
Mean duration of follow up (y)
Events (n)2427359188
Incidence/100000 p-y (95% CI)5301
(5090 to 5512)
(713 to 878)
(325 to 433)