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[Air pollutant burden and bronchial asthma in school children]
J Kühr1, A Hendel-Kramer, W Karmaus
1Universitäts-Kinderklinik, Freiburg.
Insights
Indoor stove heating significantly increases childhood asthma risk by 4.8-fold. Cutaneous reactions also strongly correlate with asthma prevalence in children, highlighting key environmental and biological factors.
Area of Science:
- Environmental Health
- Pediatric Allergy
- Epidemiology
Background:
- Childhood asthma prevalence is a growing public health concern.
- Understanding the impact of indoor and outdoor environmental exposures is crucial for prevention.
- Previous studies suggest links between home environment and respiratory health.
Purpose of the Study:
- To investigate the association between indoor/outdoor exposures and childhood asthma.
- To identify specific risk factors within the home environment.
- To analyze the influence of outdoor air pollutants on asthma prevalence.
Main Methods:
- Cross-sectional study of 704 children (aged 7-16) in Freiburg and Black Forest.
- Standardized interviews and medical examinations for children and mothers.
- Assessment of indoor exposures (heating, ventilation) and outdoor pollutants (NO2, particles).
- Logistic regression models used to analyze data and estimate odds ratios.
Main Results:
- Stove heating showed a significant 4.8-fold increased risk for asthma compared to other heating types.
- Cutaneous reactions (allergic sensitization) presented a relative risk of eight for asthma.
- Other investigated indoor and outdoor factors did not show significant associations.
Conclusions:
- Indoor heating systems, specifically stoves, are a significant risk factor for childhood asthma.
- Cutaneous sensitization is a strong predictor of asthma in children.
- Further research into specific indoor environmental triggers is warranted.
Abstract:
To examine the possibility of an effect of indoor and outdoor exposures on the prevalence of asthma in childhood we conducted a cross-sectional study in the area of Freiburg city and two communities in the Black Forest. The study group consists of 704 children aged 7 to 16 years. The children and their mothers took part in a standardized interview and a medical examination. Indoor exposures were assessed from information gathered in the interview by two different indices: (a) heating system and single room heating, and (b) the amount of indoor ventilation. The measurement of outdoor pollutants took into account weekly estimations of NO2 and combustion particles. The presence of asthma was recorded according to a previous medical diagnosis. Confounders were assessed during the interview (passive smoking, genetic predisposition to asthma etc.) or during the medical examination (cutaneous sensitization with a skin prick test). For the analysis of the data we applied logistic regression models and estimated odds-ratios. Only one of the four hypothesis variables displays a significant effect on the prevalence of asthma: Stoves as heating device carry a 4.8-fold relative risk for asthma compared to other types of heating. Among the confounding variables controlled for in the explanatory model, cutaneous reactions showed a relative risk of eight.