The Butajira Rural Health Project in Ethiopia: a nested case-referent (control) study of under-5 mortality and its health and behavioural determinants.

The associations between under-5 mortality and its health and behavioural determinants were investigated in a rural district of Ethiopia, by means of a concurrent case-referent technique nested within a study-base population established in 1987. Three-hundred and six infant and child deaths registered over a period of 1 year, were contrasted with 612 controls, matched for age, sex and study area. Data were collected by trained non-medical workers using a structured questionnaire. Breastfeeding and supplementary feeding came out as strongly protective against under-5 mortality, even when controlling for parental and environmental determinants. Early termination of breastfeeding was demonstrated to have a substantial impact on mortality, particularly on that caused by diarrhoea. Late introduction of supplementary feeding, particularly of protein origin, was also associated with increased under-5 mortality. When the relative impacts of parental, environmental and behavioural determinants are compared, the greater impact of parental factors can be demonstrated, especially among infants.