Statistical Evaluation of a Fully Automated Mammographic Breast Density Algorithm

Figure 3

Bland-Altman difference plot showing agreement between the algorithm and the reference standard measures of mammographic density. The difference refers to the reference standard minus the algorithm assessment. The absolute values of the upper and lower agreement limits are <25%, which is the span of a single category in the 4-level BI-RADS density classification scheme. A bias of +1.86%, as indicated by the orange band above the horizontal zero difference line, shows that the reference standard density is on average only slightly higher than the density generated by the algorithm.