Table 5. Predictor Model of FLT from PTC Based on Individual or Combined Variables.
| Sensitivity (%) | Specificity (%) | PPV (%) | NPV (%) | |
|---|---|---|---|---|
| Tg-Ab positivity | 63 | 84 | 67 | 82 |
| Absence of calcification | 80 | 42 | 43 | 79 |
| Presence of DTD pattern | 79 | 91 | 83 | 88 |
| Tg-Ab positivity and absence of calcification | 51 | 92 | 78 | 77 |
| Tg-Ab positivity and presence of DTD pattern | 55 | 96 | 88 | 79 |
| Absence of calcification and presence of DTD pattern | 65 | 96 | 90 | 83 |
| Tg-Ab positivity, absence of calcification, and presence of DTD pattern | 45 | 99 | 96 | 77 |
FLT, focal lymphocytic thyroiditis; PTC, papillary thyroid cancer; Tg-Ab, thyroglobulin antibody; DTD pattern, "diffuse thyroid disease" pattern on US; PPV, positive predictive value; NPV, negative predictive value; US, ultrasound.