All eligible study members were contacted.
Provided information | 3,026 | ||||||
Cumulative total of deaths | 281 | ||||||
Cumulative permanent refusals | 100 | ||||||
Temporarily living abroad | 66 | ||||||
Cumulative emigrated | 397 | ||||||
Failure to contact | 1,492 | ||||||
A postal questionnaire was sent to all cohort members
Instructions are given at the head of each form.