[Retracted] Study on the Effect of B-Ultrasound NT Scan in Early Pregnancy Combined with Serum Screening in Early and Middle Pregnancy for Down Syndrome

Table 2

Comparison of pregnancy outcomes between high-risk group and low-risk group in Down syndrome screening.

Groups		Normal outcome (%)	Abnormal outcome (%)	Abnormal rate (%)
High-risk group	20	15 (75.00)	5 (25.00)	25.00
Low-risk group	148	147 (99.32)	1 (0.67)	0.67
		11.29
		< 0.05