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The indoor air and children's health study: methods and incidence rates
M C Marbury1, G Maldonado, L Waller
1Section of Chronic Disease and Environmental Epidemiology, Minnesota Department of Health, Minneapolis, MN 55414, USA.
Insights
This study found that infants experience lower respiratory illness (LRI) more often in colder months. Maternal smoking significantly increases the risk of LRI, especially wheezing-associated respiratory illness/asthma.
Area of Science:
- Environmental Health
- Pediatrics
- Epidemiology
Background:
- Indoor air pollution is a significant concern for infant health.
- Lower respiratory illness (LRI) is a common health issue in early childhood.
- Understanding risk factors for LRI is crucial for public health interventions.
Purpose of the Study:
- To investigate the relationship between indoor air pollution and LRI in infants.
- To identify specific types of LRI and their incidence rates.
- To examine demographic and environmental factors influencing LRI risk.
Main Methods:
- A prospective cohort study involving 1,424 infants followed for the first 2 years of life.
- Data collection included family/household characteristics and LRI occurrences abstracted from medical records.
- Statistical analysis using rate ratios (RR) and confidence intervals (CI) to assess risk factors.
Main Results:
- Overall LRI incidence was 48.4 per 100 child-years, with wheezing-associated respiratory illness/asthma being most common (11.5 per 100 child-years).
- LRI incidence was lowest in the first 6 months of life and higher in boys than girls.
- Maternal smoking was associated with a 1.5 RR for total LRI, and a 2.3 RR for WARI/asthma.
Conclusions:
- Infant LRI rates vary seasonally, peaking in February and March.
- Maternal smoking is a significant risk factor for LRI in infants, particularly for WARI/asthma.
- Findings are comparable to other prospective studies and highlight the importance of reducing indoor air pollutants.
Abstract:
The Indoor Air and Children's Health Study is a prospective cohort study of the relation between indoor air pollution and lower respiratory illness (LRI) during the first 2 years of life. Information on family and household characteristics was obtained from a health maintenance organization for 1,424 infants enrolled at birth. Data on LRI were abstracted from medical records. The incidence of all LRI was 48.4 per 100 child-years. Wheezing-associated respiratory illness (WARI)/asthma was the most common specific LRI, with an incidence of 11.5 per 100 child-years. Total LRI incidence was lowest during the first 6 months of life. Girls had lower incidence than boys [rate ratio (RR) = 0.8; 95% confidence interval (CI) = 0.7-0.8)]. With the exception of croup, all LRI were most common during February and March. These results are comparable with those of other prospective studies. Consistent with other studies, self-reported maternal smoking demonstrated an RR of 1.5 (95% CI = 1.2-1.8) for total LRI, but the association varied for specific LRIs from 2.3 (95% CI = 1.5-3.0) for WARI/asthma to 1.0 (95% CI = 0.7-1.6) for bronchitis.