Air Pollution and the Risk of Oral Clefts
Author Information
Author(s): Hwang Bing-Fang, Jaakkola Jouni J.K.
Primary Institution: China Medical University
Hypothesis
Does exposure to ambient air pollution increase the risk of cleft lip with or without cleft palate during pregnancy?
Conclusion
Exposure to outdoor air ozone during the first and second month of pregnancy may increase the risk of cleft lip with or without cleft palate.
Supporting Evidence
- The risk of cleft lip with or without palate increased with higher ozone levels during the first two months of pregnancy.
- Previous studies reported weak associations between air pollution and oral clefts, but this study found significant results.
- High exposure to ozone during organogenesis has been linked to developmental issues in animal studies.
Takeaway
Breathing in certain air pollutants, especially ozone, while pregnant might make it more likely for babies to be born with a split lip or palate.
Methodology
A population-based case-control study was conducted with 653 cases of cleft lip with or without palate and 6,530 controls, assessing air pollution exposure during the first three months of pregnancy.
Potential Biases
Possible regional differences in diagnostic practices and reporting could introduce bias.
Limitations
The study may have residual confounding due to unmeasured factors and potential exposure misclassification.
Participant Demographics
The study included Taiwanese newborns from 2001 to 2003, with a higher proportion of male cases and older mothers.
Statistical Information
P-Value
0.05
Confidence Interval
1.02–1.39 for first month, 1.03–1.52 for second month
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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