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. Author manuscript; available in PMC: 2014 Jan 13.
Published in final edited form as: Cancer Epidemiol. 2010 Jan 15;34(1):34–39. doi: 10.1016/j.canep.2009.12.005

Table 2.

Multivariate associations of breast cancer risk factors with subsequent risk of breast cancer among women biopsied for benign breast disease.

Cases (N=661) Controls (N=696) Multivariate odds ratio* 95% CI
Age at first live birth/number of pregnancies
    Nulliparous 132 99 1.00 Reference
    ≥25 yrs/ <3 145 121 0.81 0.51-1.28
    ≥25 yrs/ ≥3 50 74 0.44 0.25-0.78
    <25 yrs/ <3 113 154 0.53 0.33-0.86
    <25 yrs/ ≥3 149 184 0.49 0.13-0.79
    Missing 72 64
Family history of breast cancer
    No 528 583 1.00 Reference
    Yes 107 93 1.24 0.85-1.80
    Missing 26 20
Menopausal status
    Premenopausal 364 352 1.00 Reference
    Perimenopausal 63 82 0.76 0.44-1.32
    Postmenopausal 234 262 0.60 0.37-0.99
*

Adjusted for the other variables in the table, as well as histology (no BBD/non-proliferative disease, proliferative disease without atypia, atypical hyperplasia).