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Tab. 2 ROC curve from cervical length measurements, sonoelastography, and combined methods.
| Cervical length* | Elastography** | Combination of cervical length measurement and sonoelastography | |
|---|---|---|---|
| P-value | 0.0277 | 0.0147 | 0.0052 |
| Sensitivity | 0.700 | 0.667 | 0.900 |
| Specificity | 0.800 | 0.824 | 0.700 |
| Positive predictive value | 0.636 | 0.667 | 0.600 |
| Negative predictive value | 0.842 | 0.824 | 0.933 |
*Cut-off: 16.35 mm; **Blue proportion cut-off: 4.568
