- Predictive performance of the AGD cutoffs.
| Gestation age | AGD cutoff (mm) | Acc | Sens | Spec | PPV | NPV | +LH | -LH | AUC | P-value |
|---|---|---|---|---|---|---|---|---|---|---|
| 11 weeks | >5.10 | 68% | 72% | 64% | 68% | 68% | 2.00 | 0.50 | 0.738 | 0.001 |
| 12 weeks | >6.07 | 70% | 74% | 64% | 72% | 66% | 2.06 | 0.49 | 0.752 | <0.001 |
| 13 weeks | >7.17 | 64% | 69% | 59% | 67% | 60% | 1.68 | 0.59 | 0.646 | 0.017 |
| Total | >6.00 | 65% | 72% | 56% | 67% | 62% | 1.64 | 0.61 | 0.686 | <0.001 |
A positive result indicates the identification of male gender. Acc: Accuracy, Sens: sensitivity, Spec: specificity, PPV: positive predictive value, NPV: negative predictive value,+LR: positive likelihood ratio, –LR: negative likelihood ratio, and AUC: area under the curve