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

Table 4

Positive and negative likelihood ratios (LR⁺ and LR^-) of combining diagnosis using TA-CDUS and TV-CDUS in determining VP plus VCI taking gross examination as the gold standard.

TA-CDUS + TV-CDUS	Gold standard			LR^+	LR^-
	Positive	Negative	Total
Positive	36 (0.66%)	1 (0.02%)	37 (0.68%)	5251.14	0.03
Negative	1 (0.02%)	5396 (99.30%)	5397 (99.32%)
Total	37 (0.68%)	5397 (99.32%)