FIG. 2.

Histograms of lesion size (a) and lesion subtlety (b) for lesions in the training and test set. The average lesion size was 20.1 mm (range: 4.2–61.7 mm) for the training set, and 18.8 mm (range: 1.4–61.1 mm) for the test set. The average lesion subtlety ratings in both sets were 2.2 (scale 1–5, 5 very subtle).