Table 5.
Receiver-operating characteristic (ROC) curve analysis for the value of endometrial volume as estimated with VOCAL in discrimination between patients with or without hysteroscopically diagnosed endometrial polyps.
| ROC index | Value | 95% confidence interval |
|---|---|---|
| Area under the ROC curve (AUC) | 0.604 | 0.506–0.696 |
| z statistic | 1.881 | |
| P value (AUC0 = 0.5)a | 0.060 | |
| Cut-off criterion | >1.2 mL | |
| Youden index (J) | 0.324 | |
| Accuracy | 64.2% | |
| Sensitivity | 90.0% | 78.2%–96.7% |
| Specificity | 42.4% | 29.6%–55.9% |
| Positive likelihood ratio (+LR) | 1.56 | 1.2–2.0 |
| Negative likelihood ratio (−LR) | 0.24 | 0.10–0.6 |
| Positive predictive value (+PV) | 57.0% | 45.3%–68.1% |
| Negative predictive value (−PV) | 83.3% | 65.3%–94.4% |
aDeLong method.