Table 1.

Maternal, birth and infant follow-up characteristics during the early phase of the study (1969-73)

Category	Cohort age	Variables
Non-pregnancy follow-up
Socio-demographic characteristics	Married women (15 – 45 years)	Mother’s and father’s education mother’s and father’s occupation type of consanguinity religion housing conditions (roof, flooring, wall ownership) sanitation and water household size educational status of the highest educated member in the household
Parental stature		Height and weight of the father Non-pregnancy height and weight of the mother
Menstruation	Once in 5 weeks	Starting and ending date
Pregnancy follow-up
Prenatal factors	Once in 5 weeks	Antenatal care Illness during pregnancy
Obstetric characteristics		mother’s age at delivery gravida and parity Sex of the newborn place of delivery attendant at delivery number of earlier fetal deaths birth internal gestational age number of hours since the termination, when the measurement was taken
Birth measurements		birth weight, crown–heel length, head Circumference, congenital malformation
Infant follow-up	1, 2, 3, 6, 9 and 12 months	breast feeding Weight, crown–heel length, head circumference morbidity reason for withdrawal from follow up Mortality (neonatal and post-neonatal)
Childhood	6 – 8 years	Height, weight, IQ, morbidity, mortality
Adolescence	10 – 15 years	Height, weight, blood pressures