Table 4.

Risk of breast cancer according to continuous percent and absolute density for all subjects (n = 1,020)

Regression coefficientPRegression coefficientP
Percent dense volume* (%)Dense volume* (cm3)
UnadjustedSeparate predictors0.18140.010.11970.005
Both in the model0.14270.110.10710.04
Adjusted for risk factorsSeparate predictors0.25490.0010.13720.003
Both in the model0.15730.080.11060.03
Percent dense area (%)Dense area (cm2)
UnadjustedSeparate predictors0.07030.030.05680.06
Both in the model0.02860.490.01600.65
Adjusted for risk factorsSeparate predictors0.14780.00050.07600.02
Both in the model0.10790.030.03820.30
  • NOTE: Unconditional logistic regression analysis.

  • * Cubic root transformed.

  • Age at mammogram (y), age at first birth (y), weight (kg), height (cm), menopausal status (premenopausal, postmenopausal), and parity (parous, nonparous).

  • Square root transformed.