Table 2:
Diagnostic indices of US diagnoses for Bethesda class III nodules
| Measure | Exclusion of Borderline US Diagnosis (%) | Inclusion of Borderline US Diagnosis into Benign Category (%) | Inclusion of Borderline US Diagnosis into Malignant Category (%) |
|---|---|---|---|
| Sensitivity | 14/14 (100) | 14/22 (63.6) | 22/22 (100) |
| Specificity | 18/19 (94.7) | 20/21 (95.2) | 18/21 (85.7) |
| PPV | 14/15 (93.3) | 14/15 (93.3) | 22/25 (88.0) |
| NPV | 18/18 (100) | 20/28 (71.4) | 18/18 (100) |
| Accuracy | 32/33 (97.0) | 34/43 (79.1) | 40/43 (93.0) |
| False-negative rate | 0/14 (0) | 8/22 (36.4) | 0/22 (0) |
| False-positive rate | 1/19 (5.3) | 1/21 (4.8) | 3/21 (14.3) |
Note:—PPV indicates positive predictive value; NPV, negative predictive value.