Study type: Epidemiological study

Association Between Maternal Exposure to Magnetic Field Nonionizing Radiation During Pregnancy and Risk of Attention-Deficit/Hyperactivity Disorder in Offspring in a Longitudinal Birth Cohort. epidem.

Published in: JAMA Netw Open 2020; 3 (3): e201417

Aim of study (acc. to author)

A cohort study was conducted in the USA to investigate the association between maternal exposure to extremely low frequency magnetic fields during pregnancy and the risk of ADHD in their children.

Endpoint/type of risk estimation

Exposure

Assessment

Exposure groups

Group Description
Reference group 1 maternal exposure to magnetic fields, 24 h-measurement: < 0.13 µT (90th percentile)
Group 2 maternal exposure to magnetic fields, 24 h-measurement: ≥ 0.13 µT (90th percentile)

Population

Study size

Type Value
Eligible 1,482
Evaluable 1,454
Statistical analysis method: ( adjustment: )

Conclusion (acc. to author)

Children whose mothers were exposed to higher levels of magnetic fields (group 2) during pregnancy had more than twice the risk of ADHD (HR 2.01, CI 1.06-3.81) compared with children whose mothers were lower exposed (group 1). The association was stronger for ADHD that persisted into adolescence (≥ 12 years of age), with an HR of 3.38 (CI 1.43-8.02). When the subtypes of ADHD were examined, the association existed primarily for ADHD with immune-related comorbidities (asthma or atopic dermatitis) for all ADHD cases (HR 4.57, CI 1.61-12.99) and for persistent cases of ADHD (HR 8.27; CI 1.96-34.79).
The authors concluded that this study suggests that maternal exposure to higher levels of magnetic fields was associated with an increased risk of ADHD in their children, especially ADHD with immune-related comorbidity.

Study funded by

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