Abstract
Population-based studies on the association between cadmium (Cd) exposure and thyroid function are limited and have shown conflicting results. Two independent cross-sectional studies using different Cd biomarkers were carried out in six rural areas with different soil Cd levels in China. Thyroid dysfunction was defined based on levels of thyroid stimulating hormone (TSH) and free thyroxine (FT4). Multivariable linear regression, multiple logistic regression, and restrictive cubic splines models were used to estimate the association between Cd and thyroid dysfunction. For both of the two independent studies, higher Cd levels were observed to be associated with lower TSH levels and higher risk of thyroid dysfunction. The negative relationship between urinary Cd and TSH was found in both total participants (β = − 0.072, p = 0.008) and males (β = − 0.119, p = 0.020) but not in females; however, the negative relationship between blood Cd and TSH was only found in females (β = − 0.104, p = 0.024). Higher urinary Cd was associated with higher risk of thyroid dysfunction (OR = 1.77, p = 0.031), while higher blood Cd was associated with higher risk of thyroid dysfunction (OR = 1.95, p = 0.011). Results from the two independent cross-sectional studies consistently suggested that higher Cd levels were associated with sex-specific thyroid dysfunction.
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Acknowledgements
The authors express thanks to all the involved staff from the Chinese local cooperative hospitals and Centers for Disease Control and Prevention for their effort.
Funding
This research was supported by grants from the National Key Research and Development Program of China (2018YFC1801102) and (2018YFC1801105) and the National Institutes of Health of USA (R01AG019181). Author Liqin Su has received during the preparation of this manuscript.
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All authors contributed to the study conception and design. The first draft of the manuscript was written by Ranqi Shao and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
Ranqi Shao: investigation, data curation, data analysis, software, formal analysis, writing original draft, visualization.
Liqin Su: conceptualization, funding acquisition, resources, project administration, supervision, writing—review and editing.
Peng Wang: funding acquisition, resources, project administration, supervision.
Xu Han: validation, measurement, investigation, supervision.
Ting Wang: investigation, measurement, data curation.
Jun Dai: investigation, measurement, data curation.
Yi Gu: investigation, measurement, data curation.
Jiao Luo: data curation, visualization.
Lifang Deng: investigation, supervision.
Jingping Liu: investigation, supervision.
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Shao, R., Su, L., Wang, P. et al. Cadmium Exposure was Associated with Sex-Specific Thyroid Dysfunction: Consistent Evidence from Two Independent Cross-Sectional Studies Based on Urinary and Blood Cadmium Measurements. Biol Trace Elem Res (2024). https://doi.org/10.1007/s12011-024-04176-7
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DOI: https://doi.org/10.1007/s12011-024-04176-7