Study type: Epidemiological study (observational study)

Maternal cumulative exposure to extremely low frequency electromagnetic fields and pregnancy outcomes in the Elfe cohort. epidem.

Published in: Environ Int 2018; 112: 165-173

Aim of study (acc. to author)

A prospective cohort study was conducted in France to examine the association between occupational and residential maternal exposures to extremely low frequency magnetic fields and pregnancy outcomes.

Endpoint/type of risk estimation

Exposure

Assessment

Exposure groups

Group Description
Reference group 1 cumulative exposure: < 17.5 µT-days
Group 2 cumulative exposure: 17.5 - 23.8 µT-days
Group 3 cumulative exposure: 23.8 - 36.2 µT-days
Group 4 cumulative exposure: 36.2 - 61.6 µT-days
Group 5 cumulative exposure: ≥ 61.6 µT-days (90th percentile)
Reference group 6 cumulative exposure: < 44.1 µT-days
Group 7 cumulative exposure: ≥ 44.1 µT-days

Population

Study size

Type Value
Participants 16,733
Evaluable 16,717
Statistical analysis method: ( adjustment: )

Conclusion (acc. to author)

Overall 37.5% of the participants were classified in the 23.8–36.2 μT-days category (group 3). High exposures to extremely low frequency magnetic fields during pregnancy were rare: 1.3% in the ≥ 61.6 μT-days category (group 5) and 5.5% in the ≥ 44.1 μT-days category (group 7).
No statistically significant association was found between maternal cumulative exposure and premature birth between 33 and 37 weeks of gestation and small for gestational age in this exposure range.
The authors conclude that this large population-based study does not suggest that maternal exposure to extremely low frequency magnetic fields during pregnancy is highly associated with risks of premature birth between 33 and 37 weeks of gestation or small for gestational age.

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