Acute respiratory illness in the first year of primary school related to previous attendance at child care.

The aim of this study was to assess the relationship between previous child care outside the home (day care or family care) and acute respiratory illness in the first year at primary school. Participants were 445 Adelaide school children (mean age 5 years 2 months), 73 per cent of those eligible. Information about early childhood, family, child care arrangements and illness history was obtained from a questionnaire completed by parents. A respiratory illness score was calculated from the parental reports of respiratory illness experience in the winter months of the second school term in 1992. Absences from school owing to respiratory illness were counted from school records. Children who had attended child care before commencing school had fewer episodes of acute respiratory illness and had fewer absences from school than children with no child care experience. Children who had attended child care prior to commencing school experienced half as many episodes of asthma as those children who had never attended child care. Children who attend day care before age five tend to experience less acute respiratory illness than their peers on school entry. Possible explanations include selection of illness-prone children into home care, protection against respiratory illness as a result of early exposure, and a shift in the age-related peak of illness.