To reduce the costs and duration of the study, individuals born between 1962 and 1965 were excluded. Migrants were excluded from this sample. It was anticipated that some subjects would decline to participate, given that the time demanded by the tests was at least half a day. Therefore, the group finally studied included most of the subjects initially selected as replacements. In some villages, however, the number of replacements was insufficient to meet sample size requirements, and volunteers from the pool of non-sampled adolescent subjects belonging to the appropriate strata were included as additional replacements.
Parental information is useful for interpreting growth patterns in the follow-up cohort.
Some anthropometric measurements had been obtained on these subjects during the longitudinal study, particularly the mothers. Thus, the follow-up study was seen primarily as an opportunity to increase the coverage of anthropometric measurements for the fathers. Wives and heads of households All wives of men in the follow-up cohort, whether or not they had participated in the longitudinal study, were interviewed for the collection of retrospective life history information. All heads of households in which at least one of the spouses or dependents was a member of the follow-up cohort were interviewed to obtain information on the income and assets of the family. The sample included the newly formed households as well as the subjects' parents' households.