[Retracted] The Diagnostic Accuracy of Transabdominal and Transvaginal Color Doppler Ultrasound for Pregnant Women with Vasa Previa and Velamentous Cord Insertion

Table 2

Positive and negative likelihood ratios (LR⁺ and LR^-) of TA-CDUS examination in determining VP combined with VCI taking gross examination as the gold standard.

TA-CDUS	Gold standard			LR^+	LR^-
	Positive	Negative	Total
Positive	27 (0.50%)	8 (0.15%)	35 (0.65%)	492.29	0.27
Negative	10 (0.18%)	5389 (99.17%)	5399 (99.35%)
Total	37 (0.68%)	5397 (99.32%)