Table 2.
Assessment of the six dermatoscopic parameters of stability of vitiligo
| No. | Dermatoscopic parameters | Sensitivity | Specificity | PPV | NPV | LR+ | LR– | LR+/LR– |
|---|---|---|---|---|---|---|---|---|
| 1. | Border (sharp) | 94.1% | 100% | 100% | 95.5% | - | 0.254 | - |
| 2. | Pigment network (absent/reticulate) | 92.9% | 96.8% | 96% | 94.3% | 21.8 | 0.3 | 181 |
| 3. | Perilesional hyperpigmentation | 89.2% | 85.4% | 84% | 90.2% | 5.15 | 0.443 | 29.1 |
| 4. | Perifollicular pigmentation | 66.5% | 81.4% | 73.6% | 75.6% | 2.63 | 1.13 | 5.01 |
| 5. | Absence of satellite lesion | 99.6% | 34% | 60.8% | 98.6% | 1.43 | 0.618 | - |
| 6. | Absence of micro-Koebner | 100% | 11.9% | 55.9% | 100% | 1.1 | - | - |
PPV = positive predictive value, NPV = negative predictive value, LR = likelihood ratio
LR value of 1 indicates that the tests provide no additional information and LR above or below 1 increases or decrease the likelihood of stable vitiligo, respectively.