Figure 3b. Scatterplots show distributions of the 60 low-risk cases (
) and the 30 BRCA1 and BRCA2 mutation carriers (
) in the age-matched group in terms of (a) skewness versus coarseness and (b) coarseness versus contrast. As indicated by the separation line (Fig 2), the mutation carriers tended to have more dense breast tissue, with coarser and lower contrast texture patterns on their mammograms, than did the low-risk women in the age-matched group.