Traffic-related air pollution and incident asthma in a high-risk birth cohort
| Autor: | Anne DyBuncio, Christopher Carlsten, Moira Chan-Yeung, Allan B. Becker, Michael Brauer |
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| Rok vydání: | 2010 |
| Předmět: |
Male
medicine.medical_specialty Logistic regression law.invention Randomized controlled trial law Air Pollution Environmental health Epidemiology Humans Medicine Birth Year Vehicle Emissions Asthma Air Pollutants business.industry Confounding Infant Newborn Public Health Environmental and Occupational Health Environmental Exposure medicine.disease Surgery Sample size determination Epidemiological Monitoring Geographic Information Systems Female Particulate Matter Bronchial Hyperreactivity Epidemiologic Methods business Environmental Monitoring Cohort study |
| Zdroj: | Occupational and Environmental Medicine. 68:291-295 |
| ISSN: | 1351-0711 |
| DOI: | 10.1136/oem.2010.055152 |
| Popis: | Objectives The risk of incident asthma and bronchial hyper-reactivity associated with early life exposure to traffic-related air pollution has not been fully elucidated. We aimed to evaluate the hypothesis that the risk of new onset asthma is positively associated with early exposure to traffic-related air pollution in a well-characterised high-risk birth cohort. Methods Infants at high-risk for asthma were recruited for an intervention study. Birth year exposures to NO, NO 2 , black carbon and PM 2.5 were estimated by land use regression. At 7 years of age, asthma was assessed by a paediatric allergist and bronchial hyper-reactivity was measured by methacholine challenge. Associations between exposures and outcomes were analysed by stepwise multiple logistic regression, adjusted for potential confounding variables. Results Exposure estimates were available for 184 children; 23 were diagnosed with asthma and 68 with bronchial hyper-reactivity. The IQR (4.1 μg/m 3 ) of birth year PM 2.5 was associated with a significantly increased risk of asthma (OR 3.1, 95% CI 1.3 to 7.4) and with a trend to increased risk of bronchial hyper-reactivity. Similar findings were noted in association with NO and NO 2 , while black carbon did not appear to confer increased risk. Conclusion Modest elevations in exposure to some traffic-related air pollutants during the year of birth are associated with new onset asthma assessed at age 7. That significant associations were revealed in spite of a limited sample size emphasises the strengths of a high-risk birth cohort model, along with individual air pollution exposure estimates and well-characterised data on covariates and outcomes. |
| Databáze: | OpenAIRE |
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