A government study published in the New England Journal of Medicine on July 10, 1997 discovered that calcium supplements given to pregnant women to prevent preeclampsia, dangerously high blood pressure, are ineffective. The condition occurs in about 5% of pregnant women and endangers the lives of both the woman and child. The National Institutes of Health administered the study by randomly giving 4, 589 pregnant women either calcium tablets or dummy look-alikes. Seven percent of the women in each group developed preeclampsia.
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