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Receiver operating characteristic analysis for thickness
| Cut-off (mm) | Sensibility | Specificity | PPV | NPV | Overall accuracy |
| 0.9 | 1.00 | 0.03 | 0.51 | 1.00 | 0.52 |
| 5.2 | 0.76 | 0.81 | 0.80 | 0.76 | 0.78 |
| 10.0 | 0.05 | 1.00 | 1.00 | 0.51 | 0.52 |
PPV: Positive predictive value; NPV: Negative predictive value.
