Abstract
Epidemiological studies on the association of sulfur dioxide (SO2) with neural tube defects (NTDs) are lacking. The purpose of this study was to assess the aforementioned association through a population-based case–control study. This study involved 1457 NTDs cases and 7950 randomly selected healthy infants born in 14 cities in Liaoning province between 2010 and 2015. Ambient SO2 levels were acquired from 75 monitoring stations. The exposure assessment was based on the mean concentration of all stations in mother’s residential city. We used logistic regression models to assess the associations. In multivariable models adjusted for the confounding variables selected based on the 10 percent change-in-estimate method, we found that maternal SO2 exposure was positively associated with an increased risk of NTDs during the first month after conception (per 10 μg/m3 increase: adjusted odds ratio [aOR] = 1.02, 95% confidence interval [CI]: 1.00–1.04; highest versus lowest quartile: aOR = 2.55, 95% CI: 1.97–3.31) and the second month after conception (per 10 μg/m3 increase: aOR = 1.02, 95% CI: 1.00–1.04; highest versus lowest quartile: aOR=2.31, 95% CI: 1.77–3.00). For other exposure windows, positive associations also emerged in high- versus low-exposure analyses, except for the third month before conception; however, we could not further confirm significant findings from the continuous exposure analyses. Our study provides a new evidence that SO2 exposure may increase the risk of NTDs.
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Acknowledgements
We thank International Science Editing (http://www.internationalscienceediting.com) for editing this manuscript.
Funding
This study was supported by the Liaoning Providence science and technology project (2015225025 for Yan-Hong Huang) and the Shenyang science and technology project (F15-139-9-09 for Yan-Hong Huang).
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Zhang, JY., Dai, HX., Wu, QJ. et al. Maternal exposure to ambient levels of sulfur dioxide and risk of neural tube defects in 14 cities in Liaoning province, China: a population-based case–control study. J Expo Sci Environ Epidemiol 31, 266–275 (2021). https://doi.org/10.1038/s41370-020-00273-6
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DOI: https://doi.org/10.1038/s41370-020-00273-6
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