The Women's Health Initiative (WHI), begun in 1991 by the National Institutes of Health, is one of the largest studies of women's health ever undertaken. More than 160,000 post-menopausal women ages 50 to 79 were recruited into a variety of trials designed to find the best ways to prevent heart disease, breast and colorectal cancers, and osteoporosis. Thanks to the study's rigid design, most doctors view the WHI as the definitive word on women's health. Final results were due out--and eagerly awaited--in 2005. But one part of the study, involving more than 16,000 women, was halted last week. These women were...
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