Table 2

Proportional odds model for BIRADS breast density (n = 418)

CovariateOR95% CIP
Agea0.8170.723–0.9230.0012
Weightb0.8240.778–0.873<0.0001
Menopausal status (post vs. pre)0.4660.254–0.8530.0134
Estrogen use (yes vs. no)1.6571.047–2.6220.0311
No. of births0.8940.827–0.9670.0051
Age at first birthc1.2341.072–1.4200.0035
Diabetes (yes vs. no)0.5190.346–0.7780.0015
  • a OR is calculated for a difference of 5 years (e.g., a 50-year-old woman compared with a 45-year-old woman).

  • b OR is calculated for a difference of 5 kg (e.g., an 85-kg woman compared with an 80-kg woman).

  • c OR is calculated for a difference of 5 years (e.g., a woman who was 30 at first birth compared with a woman who was 25 at first birth).