Impact of Low-Level Ozone on Infant Respiratory Health
Author Information
Author(s): Triche Elizabeth W., Gent Janneane F., Holford Theodore R., Belanger Kathleen, Bracken Michael B., Beckett William S., Naeher Luke, McSharry Jean-ellen, Leaderer Brian P.
Primary Institution: Yale University School of Medicine
Hypothesis
Does low-level ozone exposure increase respiratory symptoms in infants, particularly those with asthmatic mothers?
Conclusion
Infants, especially those with asthmatic mothers, are at increased risk of respiratory symptoms from low-level ozone exposure.
Supporting Evidence
- Infants whose mothers had asthma were more likely to experience respiratory symptoms.
- Same-day 24-hr average ozone exposure increased the likelihood of wheeze by 59%.
- Only 8% of infants wheezed at least once during the study period.
- Ambient ozone levels were below U.S. EPA standards during the study.
- Infants were followed for a total of 52,421 infant-days.
Takeaway
Breathing in ozone, even at low levels, can make babies cough and wheeze, especially if their moms have asthma.
Methodology
The study followed 691 infants for respiratory symptoms while measuring ozone levels in the air.
Potential Biases
Mothers with asthma may have been more likely to report symptoms in their infants.
Limitations
The study was limited to infants from Virginia, and results may not apply to other regions; also, the number of infants with asthmatic mothers was small.
Participant Demographics
Approximately half of the infants were boys; mothers were mostly married and white, with varied education levels.
Statistical Information
P-Value
0.05
Confidence Interval
95% CI, 1.01–2.70 for wheeze; 95% CI, 1.42–3.20 for difficulty breathing
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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