Stephen J.LurieMD, PhD, Contributing EditorIndividualAuthorPhil B.FontanarosaMD, Executive Deputy EditorIndividualAuthor
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.
Newschaffer CJ, Helzlsouer KJ. Estrogen-Progestin Replacement and Risk of Breast Cancer. JAMA. 2000;284(6):691-694. doi:10.1001/jama.284.6.691