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The relation between infant indoor environment and subsequent asthma
A L Ponsonby1, D Couper, T Dwyer
1Menzies Centre for Population Health, University of Tasmania, Hobart, Australia.
Insights
Infant exposure to environmental tobacco smoke and gas heater use in the home were linked to childhood asthma. Poor indoor air quality may significantly contribute to asthma development in children.
Area of Science:
- Environmental Health
- Pediatric Epidemiology
- Respiratory Medicine
Background:
- Childhood asthma is a significant public health concern.
- The role of indoor environmental factors during infancy in asthma development requires further investigation.
- Understanding these early-life exposures is crucial for developing effective prevention strategies.
Purpose of the Study:
- To investigate the contribution of an infant's indoor environment to the development of childhood asthma.
- To examine the association between early-life exposure to environmental tobacco smoke and gas heater use and later asthma diagnosis.
- To explore the impact of aeroallergen exposure and air circulation practices on childhood asthma.
Main Methods:
- Prospective cohort study linking data from the Tasmanian Infant Health Survey (1988) and a childhood asthma survey (1995).
- Analysis included 863 matched records of infants interviewed at 1 month of age and followed up at age 7.
- Statistical methods included relative risk calculations with 95% confidence intervals, adjusted for confounders.
Main Results:
- Infant exposure to environmental tobacco smoke (adult smoking in the home) was associated with an increased risk of asthma by age 7 (RR=1.52).
- Gas heater use in the home during infancy was significantly associated with childhood asthma (RR=1.92).
- Early-life aeroallergen exposure markers showed no significant association with asthma or wheeze; air circulation practices were inconsistently linked.
Conclusions:
- Indoor environmental factors, particularly exposure to environmental tobacco smoke and gas heater emissions, play a role in childhood asthma development.
- Poor indoor air quality in infancy may be a critical factor contributing to the onset of asthma.
- Further research into specific indoor air pollutants and ventilation strategies is warranted for asthma prevention.
Abstract:
Our aim was to examine the contribution of an infant's indoor environment to childhood asthma using prospective data. We conducted a cross-sectional asthma survey in 1995 on 92% (6,378/6,911) of 7-year-olds in Tasmania, Australia. We linked these data with data collected in 1988 as part of the Tasmanian Infant Health Survey, which was designed to investigate sudden infant death. We were able to match 863 records out of the 1,111 in the 1988 survey and the 6,378 in the 1995 survey. The former group was interviewed at home at 1 month of age. In homes where at least one adult smoked in 1988, reported infant exposure to smoking in the same room in 1988 was associated with increased asthma by 1995 (relative risk = 1.52; 95% confidence interval = 1.01-2.29) after adjustment for confounders. The associations between infant exposure to environmental tobacco smoke and asthma were not consistent, however. Gas heater use in 1988 was associated with asthma (relative risk = 1.92; 95% confidence interval = 1.33-2.76). Markers of aeroallergen exposure at 1 month of age were not materially associated with asthma or wheeze. In some settings, air circulation practice with regard to bedroom door closure appeared important. Poor indoor air quality may play an important role in the development of childhood asthma.