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Skin tone distribution of the study data sets. Set A (n=1094): training and validation set; set B (n=607): testing set.
| Skin tone | Set A, n (%) | Set B, n (%) |
| Light | 690 (63.1) | 133 (21.9) |
| Intermediate | 230 (21.0) | 198 (32.6) |
| Tan | 110 (10.1) | 131 (21.6) |
| Brown | 62 (5.7) | 134 (22.1) |
| Black | 2 (0.18) | 11 (1.8) |
