Table 4. Diagnostic performances of the mean homogeneity indices obtained from 12 ROIs for discriminating Warthin tumor from normal parotid parenchyma.
| ROI size (mm2) | Optimal cutoff values | AUC ± SE (95% CI) | Sensitivities (95% CI) | Specificities (95% CI) | PPV (%) | NPV (%) | ACC (%) |
|---|---|---|---|---|---|---|---|
| 9 | 0.09 | 0.723±0.056 (0.620–0.811) | 55.6 (38.1–72.1) | 82.1 (69.6–91.1) | 66.6 | 74.2 | 71.7 |
| 28 | 0.15 | 0.784±0.049 (0.686–0.863) | 66.7 (49.0–81.4) | 78.6 (65.6–88.4) | 66.7 | 78.6 | 73.9 |
| 34 | 0.17 | 0.793±0.048 (0.696–0.870) | 80.1 (64.0–91.8) | 71.4 (57.8–82.7) | 64.3 | 84.8 | 74.8 |
| 50 | 0.19 | 0.793±0.047 (0.696–0.871) | 86.1 (70.5–95.3) | 60.7 (46.8–73.5) | 58.5 | 87.2 | 70.6 |
| 60 | 0.17 | 0.790±0.048 (0.693–0.868) | 72.2 (54.8–85.8) | 73.2 (59.7–84.2) | 63.4 | 80.4 | 72.8 |
| 82 | 0.18 | 0.776±0.051 (0.677–0.857) | 75.0 (57.8–87.9) | 73.2 (59.7–84.2) | 64.3 | 82.0 | 73.9 |
| 93 | 0.19 | 0.777±0.051 (0.679–0.857) | 72.2 (54.8–85.8) | 75.0 (61.6–85.6) | 65.0 | 80.8 | 73.9 |
| 98 | 0.19 | 0.779±0.052 (0.681–0.859) | 75.0 (57.8–87.9) | 75.0 (61.6–85.6) | 65.9 | 82.4 | 75.0 |
| 115 | 0.19 | 0.774±0.053 (0.675–0.855) | 72.2 (54.8–85.8) | 78.6 (65.6–88.4) | 68.4 | 81.5 | 76.1 |
| 130 | 0.18 | 0.773±0.054 (0.674–0.854) | 61.1 (43.5–76.9) | 87.5 (75.9–94.8) | 75.9 | 77.8 | 77.2 |
| 136 | 0.20 | 0.765±0.055 (0.665–0.847) | 66.7 (49.0–81.4) | 83.4 (67.6–89.8) | 72.1 | 79.6 | 76.9 |
| 149 | 0.17 | 0.752±0.057 (0.652–0.837) | 55.6 (38.1–72.1) | 94.6 (85.1–98.9) | 86.9 | 76.8 | 79.3 |
ROC, receiver operating characteristic curve; AUC, area under curve; ADC, apparent diffusion coefficient; SE, standard error; CI, confidence interval; ROI, region of interest; PPV, positive predictive value; NPV, negative predictive value; ACC, accuracy.