Associations Between Prenatal Exposure to Air Pollution and Congenital Hypothyroidism

Author:

Harari-Kremer Ruthie,Calderon-Margalit Ronit,Korevaar Tim I M,Nevo Daniel,Broday David,Kloog Itai,Grotto Itamar,Karakis Isabella,Shtein Alexandra,Haim Alon,Raz Raanan

Abstract

Abstract Adequate thyroid hormone availability is required for normal brain development. Studies have found associations between prenatal exposure to air pollutants and thyroid hormones in pregnant women and newborns. We aimed to examine associations of trimester-specific residential exposure to common air pollutants with congenital hypothyroidism (CHT). All term infants born in Israel during 2009–2015 were eligible for inclusion. We used data on CHT from the national neonatal screening lab of Israel, and exposure data from spatiotemporal air pollution models. We used multivariable logistic regression models to estimate associations of exposures with CHT, adjusting for ethnicity, socioeconomic status, geographical area, conception season, conception year, gestational age, birth weight, and child sex. To assess residual confounding, we used postnatal exposures to the same pollutants as negative controls. The study population included 696,461 neonates. We found a positive association between third-trimester nitrogen oxide exposure and CHT (per interquartile-range change, odds ratio = 1.23, 95% confidence interval: 1.08, 1.41) and a similar association for nitrogen dioxide. There was no evidence of residual confounding or bias by correlation among exposure periods for these associations.

Publisher

Oxford University Press (OUP)

Subject

Epidemiology

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