Study type: Epidemiological study (observational study)

Correlation between exposure to magnetic fields and embryonic development in the first trimester epidem.

Published in: PLoS One 2014; 9 (6): e101050

Aim of study (acc. to author)

A cross-sectional study was conducted in China to investigate the association between maternal magnetic field exposure during pregnancy and embryonic development in the first trimester.

Endpoint/type of risk estimation

Type of risk estimation:



Exposure groups

Group Description
Reference group 1 daily exposure to magnetic field: < 0.082 µT (3rd quartile)
Group 2 daily exposure to magnetic field: ≥ 0.082 µT (3rd quartile)


Study size

Type Value
Total 437
Participants 149
Evaluable 130

19 women excluded because they reported poor representativeness during measurement

Statistical analysis method: (adjustment: )

Results (acc. to author)

Embryonic bud length decreased with increasing maternal daily magnetic field exposure level; the correlation was statistically significant at the time-weighted-average and 3rd quartile of exposure levels, but not with median. Women with a daily exposure to magnetic fields ≥ 0.082 µT had a higher 3.95-fold risk of having a fetus with a shorter embryonic bud length than those women with exposure < 0.082 µT (OR 3.95, CI 1.10-14.20). No correlations between magnetic field exposure and embryonic sac length and histological changes in the first trimester were found.
The authors conclude that prenatal magnetic field exposure may have an adverse effect on embryonic development.

Study funded by

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