Childhood Environment and Atopic Conditions, with Emphasis on Asthma in a Chilean Agricultural Area

Background. An explanation of the etiology of atopic conditions based on the hygiene hypothesis remains controversial. Objective. To analyze exposure variables in childhood to assess their impact on hay fever, asthma, and sensitization. Methods . Data were collected on 1,232 young Chilean adults bor...

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Bibliographic Details
Published in:The Journal of asthma 2008, Vol.45 (1), p.73-78
Main Authors: Vargas, Claudio, Bustos, Patricia, Diaz, Patricia V., Amigo, Hugo, Rona, Roberto J.
Format: Article
Language:English
Subjects:
Adult
Agriculture
asthma
Asthma - epidemiology
Child
Chile - epidemiology
Cross-Sectional Studies
Environmental Exposure
farm animal
Humans
Hypersensitivity - epidemiology
Longitudinal Studies
number of siblings
pets
rhinitis
Rhinitis, Allergic, Seasonal - epidemiology
Risk Factors
sensitization
Surveys and Questionnaires
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Summary:Background. An explanation of the etiology of atopic conditions based on the hygiene hypothesis remains controversial. Objective. To analyze exposure variables in childhood to assess their impact on hay fever, asthma, and sensitization. Methods . Data were collected on 1,232 young Chilean adults born between 1974 and 1978. Information was available on consultations for infections early in life, number of siblings, sharing a bedroom, nursery school attendance, and contact with animals in the first 5 years of life. Information on asthma symptoms and rhinitis were obtained from a standardized questionnaire. Sensitization to eight allergens and bronchial hyper responsiveness (BHR) to methacholine were assessed. The study design was non-concurrent longitudinal for infectious episodes and nutritional status in the first year and cross-sectional for the other outcomes. Results. Number of siblings was associated with sensitization only (p = 0.0048). Nursery school attendance was negatively associated with positive BHR (odds ratio (OR) 0.54, 95% CI 0.30-0.95). A severe respiratory infection early in life was protective of sensitization and wheeze combined (OR 0.29, 95%CI 0.12-0.74). Contact with dogs in the first year was a protective factor of rhinitis (OR 0.47, 95%CI 0.28-0.80), but contact with poultry and cats early in life increased the risk of rhinitis (OR 1.42, 95%CI 1.06-1.88; 1.82, 95%CI 1.06-3.14). Conclusion. The pattern of associations between environmental exposure in early life and atopic conditions was inconsistent. The significant associations were evenly distributed as protective and risk factors of atopic conditions.
ISSN:0277-0903
1532-4303
DOI:10.1080/02770900701752540