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[Day care centers, infections and asthma]
W Nystad1, A Skrondal, P Magnus
1Seksjon for epidemiologi Avdeling for samfunnsmedisin Statens institutt for folkehelse Postboks 4404 Torshov 0403 Oslo. wenche.nystad@folkehelsa.no
Summary
Day care attendance increases children's asthma risk, with recurrent respiratory infections acting as a key mediator. This finding highlights the importance of understanding infection pathways in childhood asthma development.
Area of Science:
- Pediatric Allergy and Immunology
- Environmental Epidemiology
- Causal Inference in Health Research
Background:
- Childhood asthma remains a significant public health concern.
- The role of early life exposures, such as day care, requires further causal investigation.
- Recurrent respiratory tract infections are hypothesized to link environmental factors to asthma development.
Purpose of the Study:
- To investigate the causal relationship between day care attendance and childhood asthma.
- To determine if recurrent respiratory tract infections mediate the association between day care and asthma.
- To apply causal modeling techniques to epidemiological data.
Main Methods:
- Cross-sectional survey of 1,447 children aged 6-16 years in Oslo.
- Parental completion of written questionnaires.
- Recursive logit modeling to estimate direct and indirect effects (adjusted odds ratios).
Main Results:
- Day care attendance was associated with a higher risk of early infections (aOR = 1.8).
- Early infections significantly increased the risk of asthma (aOR = 4.9).
- The direct effect of day care on asthma was small and non-significant (aOR = 1.2), suggesting mediation by infections.
Conclusions:
- Day care attendance appears to increase childhood asthma risk.
- Recurrent respiratory tract infections mediate the observed association between day care and asthma.
- Findings underscore the importance of infection prevention in day care settings for asthma control.