Table 7. Pairwise comparison of AUC.
| Comparison between classification standard | Z | P |
|---|---|---|
| Old TI-RADS and new TI-RADS by CDFI | 1.322 | 0.1862 |
| Old TI-RADS and new TI-RADS by SMI | 5.063 | 0.000 |
| Old TI-RADS and new TI-RADS by CEUS | 6.491 | 0.000 |
| Old TI-RADS and new TI-RADS by CEUS+SMI | 6.775 | 0.000 |
| New TI-RADS by CDFI and SMI | 4.526 | 0.000 |
| New TI-RADS by CDFI and CEUS | 5.468 | 0.000 |
| New TI-RADS by CDFI and CEUS+SMI | 5.369 | 0.000 |
| New TI-RADS by SMI and CEUS | 2.375 | 0.0175 |
| New TI-RADS by SMI and CEUS+SMI | 2.164 | 0.0365 |
| New TI-RADS by CEUS and CEUS+SMI | 0.371 | 0.7109 |
AUC, area under the curve; TI-RADS, Thyroid Imaging Reporting and Data System; CDFI, color Doppler imaging; SMI, superb micro-vascular imaging; CEUS, contrast-enhanced ultrasound.