Journal of Cancer Prevention : pISSN 2288-3649 / eISSN 2288-3657

Table. 2.

Table. 2.

ORs and 95% CIs of breast cancer for breast density and selected risk factors

Risk factor OR (95% CI)

Age adjusted Multivariate adjusteda
Breast density
 BI-RADS 1 and 2 (< 50%) 1 1
 BI-RADS 3 (50%–75%) 1.057 (0.855–1.307) 1.110 (0.886–1.391)
 BI-RADS 4 (≥ 75%) 1.102 (0.866–1.402) 1.226 (0.994–1.592)
Age at menarche (yr)
 < 15 1 1
 ≥ 15 0.647 (0.564–0.742) 0.681 (0.588–0.789)
Age at menopause (yr)
 Premenopausal 1 1
 < 50 0.695 (0.592–0.816) 0.812 (0.679–0.971)
 ≥ 50 0.703 (0.598–0.825) 0.752 (0.626–0.904)
Number of children
 0 1.222 (1.024–1.458) 1.167 (0.962–1.417)
 1 1.178 (1.002–1.386) 1.128 (0.949–1.341)
 2 or more 1 1
Age at first birth (yr)
 < 28 1 1
 ≥ 28 1.326 (1.156–1.521) 1.198 (1.031–1.392)
Family history of breast cancer
 No history 1 1
 1st degree 1.438 (1.196–1.730) 1.444 (1.188–1.755)

BI-RADS, Breast Imaging-Reporting and Data System.

Adjusted for body mass index, smoke, drink duration, exercise, age, age at menarche, age at menopause, number of child, number of first-degree relatives with breast cancer.

J Cancer Prev 2019;24:26-32 https://doi.org/10.15430/JCP.2019.24.1.26
© 2019 J Cancer Prev