All eligible study members were contacted.
Provided information | 3,885 | ||||
Cumulative total of deaths | 275 | ||||
Cumulative permanent refusals | 45 | ||||
Temporarily living abroad | 35 | ||||
Cumulative Emigrated | 373 | ||||
Failure to contact | 749 | ||||
A postal questionnaire asking about marriage, fertility, health and employment was sent to all cohort members.
A postal questionnaire was sent to educational administrators in further and technical educational establishments where cohort members were known to be students to ask about courses attended.
Instructions are given at the head of each form.