All eligible study members were contacted: 3,899 cohort members responded to the postal questionnaire.
Provided information | 3,899 | ||||||
Cumulative total of deaths | 268 | ||||||
Cumulative permanent refusals | 7 | ||||||
Temporarily living abroad | 39 | ||||||
Cumulative emigrated | 333 | ||||||
Failure to contact | 816 | ||||||
A postal questionnaire was sent to administrators at technical and further education establishments attended by cohort members to ask about course attended.
In this and other appropriate years a postal questionnaire was sent to university students in their final year to ask about courses attended, health and employment.
A postal questionnaire on marriage and fertility, health and employment was sent to all cohort members.
Instructions are given at the head of each form.