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| Sensitivity analysis | Clinical diagnosis (%) | Ultrasonographic diagnosis (%) |
| Sensitivity | 75 | 100 |
| Specificity | 87.1 | 98.3 |
| Positive predictive value | 42.8 | 88.8 |
| Negative predictive value | 96.4 | 100 |
| Likelihood ratio | 5.8 | 62 |
| Accuracy | 85.7 | 98.5 |
