Table 1.
Measures of diagnostic accuracy for lesion classification by reported confidence in the diagnosis.
| Residents | |||||
|---|---|---|---|---|---|
| Confidence Level | Freq. (%) | Sensitivity (95% CI) | ptrend | Specificity (95% CI) | ptrend |
| 0 | 7 (0.5) | 100.0 (2.5–100.0) | 0.54 | 16.7 (0.4–64.1) | <0.001 |
| 1 | 160 (11.8) | 57.6 (44.1–70.4) | 61.4 (51.2–70.9) | ||
| 2 | 238 (17.6) | 48.6 (36.9–60.6) | 73.2 (65.7–79.8) | ||
| 3 | 289 (21.4) | 53.6 (43.2–63.8) | 70.3 (63.3–76.7) | ||
| 4 | 397 (29.4) | 51.8 (43.1–60.4) | 81.9 (76.7–86.4) | ||
| 5 | 204 (15.1) | 63.1 (50.2–74.7) | 87.8 (81.1–92.7) | ||
| 6 | 55 (4.1) | 100.0 (80.5–100.0) | 89.5 (75.2–97.1) | ||
| Dermatologists | |||||
| Confidence Level | Freq. | Sensitivity (95% CI) | ptrend | Specificity (95% CI) | ptrend |
| 0 | 26 (2.2) | 75.0 (34.9–96.8) | 0.002 | 61.1 (35.7–82.7) | <0.001 |
| 1 | 65 (5.4) | 62.5 (40.6–81.2) | 68.3 (51.9–81.9) | ||
| 2 | 97 (8.1) | 52.0 (31.3–69.8) | 58.3 (46.1–69.8) | ||
| 3 | 131 (10.9) | 67.3 (52.9–79.7) | 63.3 (51.7–73.9) | ||
| 4 | 301 (25.1) | 74.3 (64.8–82.3) | 64.8 (57.7–71.5) | ||
| 5 | 342 (28.5) | 79.5 (70.8–86.5) | 76.1 (70.0–81.4) | ||
| 6 | 238 (19.8) | 91.9 (83.2–97.0) | 90.2 (84.6–94.3) | ||
Readers reported a mean confidence of 3.7 (SD=1.51). Dermatologists had higher confidence than residents (4.2 vs. 3.3, p<0.001).