Maternal exposure to magnetic fields during pregnancy in relation to the risk of asthma in offspring

NLi, DK, Chen H, Odouli R – Division of Research, Kaiser Permanente, Canada
Asthma was clinically diagnosed among 626 children who were followed up for as long as 13 years. All participants carried a meter to measure their MF levels during pregnancy.
RESULTS: …an increased risk of asthma in offspring: every 1-mG increase of maternal MF level during pregnancy was associated with a 15% increased rate of asthma in offspring. …compared with the children whose mothers had a low MF level (median 24-hour MF level, ≤0.3 mG) during pregnancy, children whose mothers had a high MF level (>2.0 mG) had more than a 3.5-fold increased rate of asthma … while children whose mothers had a medium MF level (>0.3-2.0 mG) had a 74% increased rate of asthma.
CONCLUSION: Our findings provide new epidemiological evidence that high maternal MF levels in pregnancy may increase the risk of asthma in offspring.
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