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The Mayo Clinic Cohort Study of Oophorectomy and Aging included 1274 premenopausal women with unilateral oophorectomy (followed for a median of 29.5 years) and 1091 premenopausal women with bilateral oophorectomy (followed for a median of 25 years) who had surgery from 1950 through 1987, compared with 2383 matched women from the same population of women who had not undergone oophorectomy.

To Save or Not to Save the Ovaries: The Mayo Clinic Study

The Mayo Clinic Cohort Study of Oophorectomy and Aging included 1274 premenopausal women with unilateral oophorectomy (followed for a median of 29.5 years) and 1091 premenopausal women with bilateral oophorectomy (followed for a median of 25 years) who had surgery from 1950 through 1987, compared with 2383 matched women from the same population of women who had not undergone oophorectomy.