Table 2. The optimal threshold of quantitative parameters to diagnose the grading of ccRCC.
| Group | AUC | Threshold | Sensitivity | Specificity |
|---|---|---|---|---|
| CP | ||||
| 70keV | 0.857 | 109.24 | 87.1(30) | 87.5 (24) |
| NIC | 0.771 | 0.35 | 83.9 (29) | 75.0 (20) |
| Slope | 0.885 | 4.03 | 90.3 (32) | 87.5(24) |
| PP | ||||
| 70keV | 0.675 | 107.98 | 45.2 (16) | 93.7 (25) |
| NIC | 0.710 | 0.85 | 58.1 (20) | 87.5 (24) |
| slope | 0.693 | 3.65 | 58.1 (20) | 87.5 (24) |
NIC, normalized iodine concentration; CP, cortex phase; PP, parenchyma phase. Threshold 70keV are cited in Hounsfield (HU). Threshold NIC in CP and PP are represented as mg/mL. Sensitivity values are demonstrated as %. Data in parentheses are numbers of low-grade ccRCC lesions (n = 35) used to calculate percentages. Specificity values are cited as %. Data in parentheses are numbers of low-grade ccRCC lesions (n = 27) used to calculate percentages.