The schools of all eligible study members were contacted.
| Provided information | 4,077 | ||||||
| Cumulative total of deaths | 240 | ||||||
| Cumulative permanent refusals | 1 | ||||||
| Temporarily living abroad | 37 | ||||||
| Cumulative emigrated | 273 | ||||||
| Failure to contact | 734 | ||||||
The study member’s teacher and the school’s head teacher completed the postal questionnaire about the type of school, the child’s attainment and behaviour, and parental interest.
Instructions are given at the head of each form.