Table 2.
Diagnostic values measuring detection of malignant skin lesions for different confidence levels.
| Experience | Collective size | Confidencea | Sensitivity, % (95% CI) | Specificity, % (95% CI) | Positive predictive values, % (95% CI) | Negative predictive values, % (95% CI) |
| Nonexpert | —b | All | 73.1 (72.7 to 73.5) | 77.4 (77.0 to 77.7) | 75.1 (74.7 to 75.5) | 75.5 (75.1 to 75.9) |
| Nonexpert | 4 | All | 74.6 (73.9 to 75.2) | 78.0 (77.5 to 78.5) | 74.5 (73.9 to 75.2) | 78.0 (77.5 to 78.6) |
| Nonexpert | 8 | All | 76.9 (76.3 to 77.5) | 80.1 (79.6 to 80.6) | 77.0 (76.4 to 77.6) | 80.1 (79.5 to 80.6) |
| Nonexpert | — | Low | 66.3 (65.6 to 67.0) | 69.7 (69.1 to 70.4) | 69.4 (68.7 to 70.1) | 66.7 (66.0 to 67.3) |
| Nonexpert | 4 | Low | 68.7 (68.0 to 69.4) | 74.6 (74.0 to 75.2) | 70.3 (69.7 to 71.0) | 73.1 (72.5 to 73.7) |
| Nonexpert | 8 | Low | 70.9 (70.3 to 71.6) | 76.5 (75.9 to 77.0) | 72.5 (71.9 to 73.2) | 75.0 (74.4 to 75.6) |
| Nonexpert | — | High | 77.6 (77.1 to 78.0) | 81.6 (81.2 to 82.0) | 78.7 (78.3 to 79.2) | 80.5 (80.1 to 81.0) |
| Nonexpert | 4 | High | 76.9 (76.3 to 77.5) | 77.6 (77.0 to 78.1) | 74.8 (74.2 to 75.4) | 79.5 (79.0 to 80.0) |
| Nonexpert | 8 | High | 78.3 (77.7 to 78.8) | 79.0 (78.4 to 79.5) | 76.3 (75.7 to 76.9) | 80.8 (80.2 to 81.3) |
| Expert | — | All | 74.0 (72.2 to 75.8) | 85.8 (84.4 to 87.2) | 83.1 (81.4 to 84.7) | 77.8 (76.2 to 79.4) |
| Expert | — | Low | 64.6 (61.3 to 67.8) | 77.4 (74.3 to 80.3) | 75.6 (72.2 to 78.7) | 66.9 (63.7 to 70.0) |
| Expert | — | High | 79.4 (77.2 to 81.4) | 89.7 (88.2 to 91.1) | 87.1 (85.2 to 88.9) | 83.3 (81.5 to 85.0) |
aConfidence groups denote whether all answers of raters were measured (All) or only answers given with low or high confidence.
bNo collective size.