Table 5. Diagnostic Index of Ultrasonography in Detection of Thyroid Pyramidal Lobes According to Radiologists.
| Institutions | Sensitivity (95% CI) | Specificity (95% CI) | PPV (95% CI) | NPV (95% CI) | AUC (95% CI) |
|---|---|---|---|---|---|
| Experienced | |||||
| A (n = 100) | 79.7 (67.2-89.0) | 82.9 (67.9-92.9) | 87.0 (75.1-94.6) | 73.9 (58.9-85.7) | 0.81 (0.72-0.88) |
| B (n = 100) | 78.0 (65.3-87.7) | 97.6 (87.2-99.9) | 97.9 (88.8-99.9) | 75.5 (61.7-86.2) | 0.88 (0.80-0.94) |
| C (n = 100) | 94.4 (81.3-99.3) | 100 (94.4-100.0) | 100 (89.7-100) | 97.0 (89.5-99.6) | 0.97 (0.92-0.99) |
| D (n = 100) | 58.3 (44.9-70.9) | 95.0 (83.1-99.4) | 94.6 (81.8-99.3) | 60.3 (47.2-72.4) | 0.77 (0.67-0.85) |
| Less experienced | |||||
| E (n = 100) | 66.7 (51.0-80.0) | 74.6 (61.0-85.3) | 68.2 (52.4-81.4) | 73.2 (59.7-84.2) | 0.71 (0.61-0.79) |
| F (n = 82) | 58.6 (38.9-76.5) | 96.2 (87.0-99.5) | 89.5 (66.9-98.7) | 81.0 (69.1-89.7) | 0.77 (0.67-0.86) |
Note.- There was significant difference of diagnostic indices between all institutions by receiver operating characteristic analysis using CT result as reference standard (p < 0.001). AUC = area under curve, CI = confidence interval, NPV = negative predictive value, PPV = positive predictive value