Urinary concentrations of bisphenol mixtures during pregnancy and birth outcomes: The MAKE study

Abstract

BACKGROUND AND AIM: Bisphenols are endocrine disruptors that may be associated with altered fetal growth in humans. To date, most studies between bisphenols and birth outcomes have focused on the effect of individual bisphenol. The aim of this study was to explore the associations of urinary bisphenol mixtures with birth outcomes. METHODS: We conducted a prospective birth cohort study in South Korea. One hundred eighty mother-infant pairs were recruited from 2017 to 2019. Bisphenol A (BPA), bisphenol F (BPF), and bisphenol S (BPS) in one spot urine were analyzed using ultra-performance liquid chromatography–tandem mass spectrometry. We used two statistical approaches to examine potential associations of BPA, BPF, and BPS with birth weight and gestational age: 1) multivariable linear regression; 2) Bayesian kernel machine regression (BKMR). RESULTS:The geometric means of BPA, BPF, and BPS were 2.1, 0.2, and 0.1 μg/L, respectively. In stratified linear analyses by each median value, a higher BPF was positively associated with birth weight (g) (β = 125.5; 95% CI: 45.0 to 205.9). Mixture analyses using BKMR suggested an inverse association between bisphenol mixtures and birth weight. CONCLUSIONS:Our findings suggest that in utero bisphenol exposure may influence birth weight and that such relationships may differ considering non-linearity and the combined effect. KEYWORDS: Phenols, Birth outcomes, Mixtures analysis, Environmental epidemiology