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Factors affecting serum PFAS concentrations among US females with surgically and naturally induced menopause: data from NHANES 2003–2018

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Abstract

Sex hormones influence excretion of the biopersistent per-and polyfluoroalkyl substances (PFAS) in rodents, but such influences in human studies are less clear. Data from National Health and Nutrition Examination Survey (NHANES) for 2003–2018 for US females aged ≥ 20 years who reported having hysterectomy (HYST, N=1064) and who reported being in natural menopause (MENOP, N=1505) were analyzed for associations of ever use of birth control pills, past pregnancies, live births, and other factors with serum concentrations of six per- and polyfluoroalkyl substances (PFAS). For both HYST and MENOP, PFAS concentrations computed as adjusted geometric means (AGM) were higher among those who took female replacement hormone therapy (HRT) compared to nonusers in multivariable adjusted models, for example PFOS in HRT takers (10.70 ng/mL; 95% C.I. 9.46–12.11) vs. 8.70 ng/mL (95% C.I. 8.07–9.37) in nonusers (p<0.01), and PFOA in HRT users was 2.85 ng/mL (95% C.I. 2.53–3.21) vs. 2.44 ng/mL (95% C.I. 2.32–2.36) in nonusers (p=0.01), with similar findings across race/ethnicity stratifications. HYST participants with retained ovaries sometimes had higher serum PFAS than those without ovaries in post-HYST participants not taking HRT, but results had overlap** confidence intervals in all cases and were inconsistent. PFASs were inversely associated with obesity and directly associated with higher SES as reflected in poverty income ratio (PIR) in most cases, yet HRT results for the entire population are robust to adjustments for obesity and PIR. The results suggest the hypothesis that exogenous hormone use, and specifically estrogen hormones, are associated with higher serum PFAS in postmenopausal women. We discuss potential explanations for the findings, including data from other populations that estrogens may delay the onset of kidney disease, a finding which might paradoxically increase serum PFAS among the HRT population to explain some or all of our findings in a menopausal population.

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Data availability

All data used for analysis for this study are in public domain and available free of cost at www.cdc.gov/nchs/nhanes/index.htm.

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Ram B Jain: study design, statistical analysis, interpretation of results, writing, editing, and reviewing of draft and final manuscript. Alan Ducatman: study design, interpretation of results, writing, editing, and reviewing of draft and final manuscript.

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Correspondence to Ram B. Jain.

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Since this study did not recruit any human and/or animal subjects, this section does not apply.

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Competing interests

Ram B Jain declares that he had no financial and other conflicts that could have affected the conclusions arrived at in this communication. Alan Ducatman has received funding for health communications related to the enrollment and health communications of the C8 Health Project and he has provided paid scientific support to communities seeking similar class action support to institute medical monitoring following exposure to drinking water contaminants.

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Jain, R.B., Ducatman, A. Factors affecting serum PFAS concentrations among US females with surgically and naturally induced menopause: data from NHANES 2003–2018. Environ Sci Pollut Res 30, 84705–84724 (2023). https://doi.org/10.1007/s11356-023-28395-y

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  • DOI: https://doi.org/10.1007/s11356-023-28395-y

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