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Prenatal metal concentrations and physical abnormalities in the Japan Environment and Children’s Study

  • Population Study Article
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A Correction to this article was published on 08 March 2024

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Abstract

Background

The association between prenatal metal exposure and congenital anomalies is unclear. We aimed to examine the association between exposure to cadmium, lead, mercury, selenium, and manganese and physical abnormalities.

Methods

Data from 89,887 pregnant women with singleton pregnancies who participated in the Japan Environment and Children’s Study (JECS) were used. The correlation between maternal blood metal concentrations and physical abnormalities during the second or third trimester was investigated using logistic regression models. Physical anomalies included those observed at birth or at 1 month, primarily from ICD-10 Chapter 17, particularly congenital anomalies associated with environmental factors (e.g., hypospadias, cryptorchidism, cleft lip and palate, digestive tract atresia, congenital heart disease, and chromosomal abnormalities) and minor abnormalities.

Results

After adjusting for covariates, the OR (95% CIs) of physical abnormalities for a one-unit rise in Mn concentrations in all individuals were 1.26 (1.08, 1.48). The OR (95% CIs) of physical abnormalities in the 4th quartile (≥18.7 ng/g) were 1.06 (1.01, 1.13) (p-value for the trend = 0.034) compared with those in the 1st quartile (≤12.5 ng/g).

Conclusion

In Japan, maternal blood Mn concentrations above threshold during pregnancy may slightly increase the incidence of physical abnormalities.

Impact

  • Physical abnormalities (including minor anomalies and congenital anomalies) are associated with prenatal manganese concentrations.

  • They are not associated with cadmium, lead, mercury, and selenium concentrations.

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Fig. 1: Flow chart for the selection of participants.
Fig. 2: Combined effects of metal exposure on physical abnormalities.

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Data availability

Regarding Data of the Paper Publication http://www.env.go.jp/chemi/ceh/en/index.html. Data are unsuitable for public deposition owing to ethical restrictions and legal framework of Japan. It is prohibited by the Act on the Protection of Personal Information (Act No. 57 of 30 May 2003, amendment on 9 September 2015) to publicly deposit the data containing personal information. Ethical Guidelines for Medical and Health Research Involving Human Subjects enforced by the Japan Ministry of Education, Culture, Sports, Science and Technology and the Ministry of Health, Labor and Welfare also restrict the open sharing of epidemiologic data. All inquiries about access to data should be sent to: jecs-en@nies.go.jp. The person responsible for handling enquiries sent to this e-mail address is Dr Shoji F. Nakayama, JECS Program Office, National Institute for Environmental Studies.

Change history

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Acknowledgements

We thank all the mothers and their children who participated in the JECS. We wish to express our sincere appreciation to the collaborating hospitals and clinics. We also express our gratitude to all the JECS staff members in Hokkaido, Miyagi, Fukushima, Chiba, Kanagawa, Koshin, Toyama, Aichi, Kyoto, Osaka, Hyogo, Tottori, Kochi, Fukuoka, and South Kyushu/Okinawa Regional Centers, the National Center for JECS (program office), and the Medical Support Center.

Funding

The JECS was funded by the Ministry of the Environment, Japan. The findings and conclusions of this article are solely the responsibility of the authors and do not represent the official views of the Japanese Government.

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Contributions

Y.N., S.K., K.C., S.I., C.M., T.Y. and R.K. conceived and designed the study. Y.N., S.K., K.C., S.I., C.M., T.Y., Y.S., Y.I. and R.K. performed the data collection. Y.N., S.K., K.C., H.I. and N.T. performed the statistical analysis and contributed to the manuscript preparation and literature search. Y.N., S.K., K.C., S.I., C.M. and T.Y. interpreted the data. Y.N., S.K., K.C., S.I., C.M., T.Y., H.I., N.T., Y.S., Y.I. and R.K. contributed to the critical revision of the manuscript for important intellectual content. S.K., K.C., A.M. and R.K. contributed to the funds collection and were supervisors of the study. All authors approved the version of the manuscript to be published.

Corresponding author

Correspondence to Sumitaka Kobayashi.

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The original online version of this article was revised: the authors identified a siginificant modification related to the results of the regression analysis. The primary focus of the analysis, manganese, remains almost unchanged. However, there are slight alterations in the 95% confidence intervals and p-values for cadmium, lead, mercury, and selenium in Table 3, Supplementary Table 2 and Supplementary Table 3.

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Nakamura, Y., Kobayashi, S., Cho, K. et al. Prenatal metal concentrations and physical abnormalities in the Japan Environment and Children’s Study. Pediatr Res (2023). https://doi.org/10.1038/s41390-023-02851-4

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