Skip to main content
. Author manuscript; available in PMC: 2013 Jul 1.
Published in final edited form as: Cancer Epidemiol Biomarkers Prev. 2012 May 7;21(7):1089–1096. doi: 10.1158/1055-9965.EPI-12-0201

Table 4.

Breast cancer risk, menopausal status and history of bilateral oophorectomy, by age at diagnosis.

Age at diagnosis Pairs (n) Menopausal Menopausal1 P Oophorectomy Oophorectomy P
% OR (95%CI)2 % OR (95%CI)
<=30 276 0.4 n/a3 0.2 n/a3
31–35 567 1.5 1.43 (0.54–2.74) 0.47 0.5 1.00 (0.20–4.96) 1.00
36–40 711 4.9 0.62 (0.37–102) 0.06 3.0 0.23 (0.10–0.51) 0.0004
41–45 607 9.7 0.75 (0.52–1.09) 0.13 4.5 0.36 (0.20–0.66) 0.001
46–50 384 25.0 0.55 (0.39–0.79) 0.001 9.1 0.35 (0.20–0.60) 0.0002
>=50 309 81.4 0.53 (0.33–1.88) 0.01 17.0 0.46 (0.29–0.72) 0.0006
all 2854 15.8 0.65 (0.53–0.79) <0.0001 4.9 0.38 (0.29–0.50) <0.0001
1

Menopausal includes natural, surgical, medication- and radiation-induced menopause, cases and controls combined.

2

Estimates are univariate odds ratios.

3

n/a = estimates could not be generated because there were too few individuals that were menopausal (n = 2) or had an oophorectomy (n = 1) for age at diagnosis ≤ 30.