Sunday, 8 December 2013

Electromagnetic radiation not linked to miscarriage - Guangdong study

by Michael Woodhead
Exposure to extremely low-frequency magnetic fields does not seem to increase miscarriage risk, a Guangdong study has suggested.
Dr Wang Qiang and co-researchers from the Department of Environmental Epidemiology, Institute for Environmental Health and Related Product Safety, Chinese Center for Disease Control and Prevention, Beijing, studied pregnancy outcomes among women in two towns in the Pearl Delta region with densely distributed power supply constructions. From 2010 to 2012, 413 women in the region who were at approximately 8 weeks of gestation or who planned to have a baby within one year were selected as candidate subjects. Exposure to magnetic fields was estimated by measurements at their front doors and in the alley in front of the subjects’ houses
The average residential exposure to magnetic fields was 0.099 µT. Miscarriage risk was found to be significantly associated with maximum levels of exposure to magnetic fields in alleys. After adjustment, the risk of maximum alley exposure to magnetic fields for miscarriage was 72% higher. However, No significantly increased risk of miscarriage was seen with the average front-door exposure to magnetic fields.,
The researchers said that although the miscarriage incidence was shown to be positively associated with the maximum alley magnetic field exposure, the association between miscarriage risk and the exposure to magnetic fields was not confirmed in the study. They noted that the intensities of exposure were relatively low. The average exposure level was only approximately 2 times higher than that of the general public (0.05μT). Among all 413 pregnant women, only 34 subjects (8.2%) were exposed to MFs above 0.4µT.
“We can’t confirm 50 Hz MF as one of the possible risks of miscarriage,” they conclude.
Source: PLOS One

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