Diagnostic Value and High-Risk Factors of Two-Dimensional Ultrasonography Combined with Four-Dimensional Ultrasonography in Prenatal Ultrasound Screening of Fetal Congenital Malformations

Table 2

Comparison of 2D-US, 4D-US, and their combined detection results with pregnancy outcomes.

Examination method		Pregnancy outcomes		Total
		Positive	Negative
2D-US	Positive	38 (1.69)	369 (16.42)	407 (18.11)
	Negative	49 (2.18)	1791 (79.71)	1840 (81.89)
4D-US	Positive	45 (2.00)	325 (14.46)	370 (16.47)
	Negative	42 (1.87)	1835 (81.66)	1877 (83.53)
Joint examination	Positive	79 (3.52)	136 (6.05)	215 (9.57)
	Negative	8 (0.36)	2024 (90.08)	2032 (90.43)