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Reproductive Health

Maternal Exposure to Magnetic Fields During Pregnancy in Relation to the Risk of Asthma in Offspring

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Authors not listed · 2011

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Pregnant mothers exposed to magnetic fields above 2.0 milligauss had children with 3.5 times higher asthma rates.

Plain English Summary

Summary written for general audiences

Researchers followed 626 children for up to 13 years after measuring their mothers' magnetic field exposure during pregnancy. Children whose mothers had the highest magnetic field exposure (above 2.0 milligauss) were 3.5 times more likely to develop asthma compared to those with low exposure mothers. The study found a clear dose-response relationship where every 1 milligauss increase in maternal exposure increased asthma risk by 15%.

Why This Matters

This Kaiser Permanente study reveals a troubling connection between prenatal magnetic field exposure and childhood respiratory health that deserves serious attention. The 3.5-fold increase in asthma risk for high-exposure children represents one of the strongest EMF health associations documented in peer-reviewed research. What makes this particularly concerning is that the 'high' exposure level of 2.0 milligauss is easily reached in many homes through proximity to electrical panels, appliances, and power lines. The clear dose-response relationship strengthens the evidence for causation rather than mere correlation. This research adds to growing evidence that the developing fetus may be especially vulnerable to EMF exposure, with health consequences that persist into childhood and potentially beyond.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
Unknown (2011). Maternal Exposure to Magnetic Fields During Pregnancy in Relation to the Risk of Asthma in Offspring.
Show BibTeX
@article{maternal_exposure_to_magnetic_fields_during_pregnancy_in_relation_to_the_risk_of_asthma_in_offspring_ce1341,
  author = {Unknown},
  title = {Maternal Exposure to Magnetic Fields During Pregnancy in Relation to the Risk of Asthma in Offspring},
  year = {2011},
  doi = {10.1001/archpediatrics.2011.135},
  
}
DOI: 10.1001/archpediatrics.2011.135PubMed: 21810627

Quick Questions About This Study

This study found children whose mothers had high magnetic field exposure during pregnancy were 3.5 times more likely to develop asthma. The research followed 626 children for up to 13 years, showing a clear dose-response relationship.
Maternal exposure above 2.0 milligauss during pregnancy was associated with the highest asthma risk. Even medium exposure (0.3-2.0 milligauss) increased risk by 74% compared to low exposure below 0.3 milligauss.
Every 1 milligauss increase in maternal magnetic field exposure during pregnancy was associated with a 15% increase in childhood asthma risk, showing a clear linear dose-response relationship in this 13-year study.
Yes, the study found a significant synergistic interaction between magnetic field exposure and maternal asthma history. The EMF effect was also stronger in firstborn children, suggesting multiple risk factors compound each other.
Researchers followed 626 children for up to 13 years after their mothers carried magnetic field meters during pregnancy. This long follow-up period strengthens the evidence linking prenatal EMF exposure to childhood asthma development.