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August 9, 2000

Estrogen-Progestin Replacement and Risk of Breast Cancer

Author Affiliations
 

Stephen J.LurieMD, PhD, Contributing EditorIndividualAuthorPhil B.FontanarosaMD, Executive Deputy EditorIndividualAuthor

JAMA. 2000;284(6):691-694. doi:10.1001/jama.284.6.691

To the Editor: Dr Schairer and colleagues1 address concerns over bias introduced by estimating age at menopause2 by repeating their analyses excluding women with unknown age at menopause, ostensibly leaving only women with natural menopause and bilateral oophorectomy in their sample.

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