Prenatal exposure to magnetic fields may cause miscarriage – report by the Kaiser Foundation – Brief Article
In order to study the relation between magnetic fields and the risk of miscarriage, the Kaiser Foundation Research Institute contacted a number of women in the San Francisco area who were recently found to be pregnant.
The women, all of whom had been pregnant for less than 10 weeks, were first interviewed in person to obtain as much information about risk factors and other potential confounders. The participants were asked to wear a magnetic field measuring device for 24 hours and to keep a diary of their activities.
After the initial round of interviews, researchers checked medical records, health care databases, and medical charts as well as a follow-up phone call to determine the outcomes of each pregnancy. Researchers used the Cox proportional hazards model for examining the association.
In all, more than 900 women were accepted to be used in the final conclusion.
Although researchers did not observe an association between the risk of a miscarriage and the average magnetic field level, there was an increase in miscarriage risk and an increasing level of magnetic field exposure. The threshold for exposure was shown to be about 15 milligauss (mG.)
The findings suggest that prenatal magnetic field exposure above a certain level may be associated with miscarriage risk.
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