The mothers of all eligible study members were contacted: 4,181 mothers of cohort members were interviewed.
| Provided information | 4,181 | ||||||
| Cumulative total of deaths | 239 | ||||||
| Cumulative permanent refusals | 1 | ||||||
| Temporarily living abroad | 40 | ||||||
| Cumulative emigrated | 275 | ||||||
| Failure to contact | 626 | ||||||
School nurses and health visitors interviewed mothers at home about the child’s health, development and behaviour, school absences, the mother’s work, and the home and family circumstances; they also commented on the state of the dwelling.
Instructions are given at the head of each form.