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

Table 3

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

TV-CDUS	Gold standard			LR^+	LR^-
	Positive	Negative	Total
Positive	33 (0.61%)	7 (0.13%)	40 (0.74%)	687.65	0.11
Negative	4 (0.07%)	5390 (99.19%)	5394 (99.26%)
Total	37 (0.68%)	5397 (99.32%)