Figure 2

Distributions of mammographic volumetric density and percent volumetric density shown as fitted model curves. The mean volumetric density and percent volumetric density for each age were fitted in the rational model; the curve represents associations with age. (a) The fitted curve of mean volumetric density for each age. (b) The fitted curve of mean percent volumetric density for each age. Each data point represents the mean value for each age. DV: volumetric density, VPD: percent volumetric density.