Women's Health Initiative: Not over yet

Published: May, 2006

The largest study of women's health has raised at least as many questions as it has answered. Stay tuned.

In December 1993, the federally funded Women's Health Initiative (WHI) set out to enroll one out of every 200 women in the United States, ages 50–79, in a 12-year study to fill gaps in medical knowledge about postmenopausal women's health and chronic disease prevention. This prodigious undertaking involved 40 clinical centers, 1,000 investigators and staff, and 161,808 women — the largest study of its kind and the most comprehensive look to date at several women's health problems.

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