Distribution and variation between Cumulus and AutoDensity . (A) Scatter plot of screened population percentiles of dense area for a 20% random sample of the study group. (B) Bland-Altman plot of agreement between Cumulus and AutoDensity dense area for a 20% random sample of the study group. The x-axis shows the mean value of the Cumulus and AutoDensity measurements for each image, on a log scale. (C) Quantile-quantile plot of dense area percentiles of Cumulus against percentiles of AutoDensity (a deviation from the diagonal indicates a difference in distributions). (D) Cross-classification of quintile-decile groups (%).