Anterior cervical angle, despite low specificity and positive predictive value, may be significant in predicting the preterm birth with a sensitivity of 100%, NPV of 100%, an LR+of 1.41, and LR-of 0.00, especially in correlation with cervical length.
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Prediction of Preterm Birth with Serial Measurements of Ultrasound Markers.
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The sentences
Cervical length <25mm, was highly significant in the prediction of preterm labor with a sensitivity of 99%, specificity of 61%, positive predictive value (PPV) of 78%, negative predictive value (NPV) of 97 %, and a positive likelihood ratio (LR+) of 2.54 and negative likelihood ratio (LR-) of 0.02.