The mothers of all eligible study members were contacted. In addition the school doctor completed an assessment and the schools were asked to provide various details. The study members were also given a self-completion questionnaire and some tests.
| Provided information | 4,274 | ||||||
| Cumulative total of deaths | 250 | ||||||
| Cumulative permanent refusals | 1 | ||||||
| Temporarily living abroad | 26 | ||||||
| Cumulative Emigrated | 295 | ||||||
| Failure to contact | 516 | ||||||
School nurses and health visitors interviewed mothers at home; this was the final interview with the mothers. Teachers completed a postal questionnaire about the study member and administered the cognitive tests. Headteachers completed the postal questionnaire about the school and school doctors carried out the medical examination. Hospitals to which study member children had been admitted were asked to complete a postal questionnaire about health, length of admission, visiting arrangements, diagnosis, treatment and discharge.
Instructions are given at the head of each form.
More detailed information on the mother-collected topics collected is available here
More detailed information on the teacher-collected topics collected is available here
More detailed information on the doctor-collected topics collected is available here