Abstract
There is limited evidence linking exposure to heavy metals, especially mixed metals, to stress urinary incontinence (SUI). This study aimed to explore the relationship between multiple metals exposure and SUI in women. The data were derived from the National Health and Nutrition Examination Survey (NHANES), 2007–2020. In the study, a total of 13 metals were analyzed in blood and urine. In addition, 5155 adult women were included, of whom 2123 (41.2%) suffered from SUI. The logistic regression model and restricted cubic spline (RCS) were conducted to assess the association of single metal exposure with SUI risk. The Bayesian kernel machine regression (BKMR) and weighted quantile sum (WQS) were used to estimate the combined effect of multiple metals exposure on SUI. First, we observed that blood Pb, Hg and urinary Pb, Cd were positively related to SUI risk, whereas urinary W was inversely related by multivariate logistic regression (all p-FDR < 0.05). Additionally, a significant non-linear relationship between blood Hg and SUI risk was observed by RCS analysis. In the co-exposure models, WQS model showed that exposure to metal mixtures in blood [OR (95%CI) = 1.18 (1.06, 1.31)] and urine [OR (95%CI) = 1.18 (1.03, 1.34)] was positively associated with SUI risk, which was consistent with the results of BKMR model. A potential interaction was identified between Hg and Cd in urine. Hg and Cd were the main contributors to the combined effects. In summary, our study indicates that exposure to heavy metal mixtures may increase SUI risk in women.
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Data availability
The datasets analyzed during the current study are openly available in https://www.cdc.gov/nchs/nhanes/.
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Acknowledgements
All authors thank NHANES for providing the publicly available data.
Funding
This work was supported by the Opening Foundation of Key Laboratory (JSHD202317); Jiangsu Province Capability Improvement Project through Science, Technology and Education (ZDXYS202210); and Jiangsu Provincial Special Program of Maternal and child health (F202326).
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XY: Conceptualization, methodology, data curation, visualization, writing—original draft. MJ: Methodology, visualization. YD: Methodology, resources. JW: Supervision, review & editing. HJ: Conceptualization, resources, supervision, review & editing. All authors read and approved the final manuscript.
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Yao, X., Jiang, M., Dong, Y. et al. Association between exposure to multiple metals and stress urinary incontinence in women: a mixture approach. Environ Geochem Health 46, 149 (2024). https://doi.org/10.1007/s10653-024-01929-0
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DOI: https://doi.org/10.1007/s10653-024-01929-0