Table 2. Diagnostic Performance of S-Shearwave According to Measurement Location.
| Mass Center | Superior Margin | Right Lateral Margin | Left Lateral Margin | Overall p | |
|---|---|---|---|---|---|
| Cut-off level* (kPa) | > 25.8 | > 32.2 | > 24.1 | > 29.5 | - |
| Sensitivity | 80.0 (70.6–89.4) | 82.9 (74.0–91.7) | 68.6 (57.7–79.5) | 70.0 (59.3–80.7) | 0.024 |
| Specificity | 63.2 (55.6–70.8) | 63.9 (56.3–71.4) | 70.3 (63.1–77.5) | 74.2 (67.3–81.1) | 0.014 |
| PPV | 49.6 (40.3–58.8) | 50.9 (41.7–60.1) | 51.1 (41.0–61.2) | 55.1 (44.7–65.4) | 0.521 |
| NPV | 87.5 (81.4–93.6) | 89.2 (83.4–95.0) | 83.2 (76.8–89.6) | 84.6 (78.5–90.6) | 0.189 |
| Accuracy | 68.4 (62.4–74.5) | 69.8 (68.8–75.8) | 69.8 (63.8–75.8) | 72.9 (67.1–78.7) | 0.586 |
| AUC | 0.716 (0.656–0.777) | 0.734 (0.675–0.792) | 0.695 (0.629–0.760) | 0.721 (0.657–0.785) | > 0.999 |
95% confidence intervals are in parentheses.
*Cut-off level is calculated by Youden's index with the maximum S-Shearwave elasticity among the median values calculated from the three elasticity measurements obtained from each location.
AUC = area under the receiver operator characteristics curve, NPV = negative predictive value, PPV = positive predictive value