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Int J Epidemiol. 1999 Oct;28(5):882-7.

Day care attendance, recurrent respiratory tract infections and asthma.

Author information

  • 1Section of Epidemiology, Department of Population Health Sciences, National Institute of Public Health, Oslo, Norway. wenche.nystad@folkehelsa.no

Abstract

OBJECTIVE:

Our objective was to use a causal model for childhood asthma to determine whether the effect of day care attendance on asthma was mediated by recurrent respiratory tract infections.

DESIGN:

A cross-sectional survey among 1447 children aged 6-16 years in Oslo. Their parents completed written questionnaires. A recursive logit model was used to estimate direct effects in terms of adjusted odds ratios (aOR).

RESULTS:

Year of birth, number of siblings and length of maternal education were significantly associated with day care attendance. Attendance at day care increased the risk of early infections, aOR = 1.8 (1.3-2.5), and infections were associated with asthma, aOR = 4.9 (3.4-7.3). The crude association between day care and asthma was cOR = 1.5 (1.0-2.2), whereas the estimated direct effect was small and nonsignificant, aOR = 1.2 (0.8-1.9). The results may be influenced by overreporting of infections among parents of children with asthma.

CONCLUSIONS:

Our results suggest that children who attend day care have an increased risk of asthma with early infections as a mediator of risk.

PMID:
10597986
[PubMed - indexed for MEDLINE]
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