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Table 2 Demographic characteristics of pregnant women undergoing NIPT

From: Clinical performance of non-invasive prenatal served as a first-tier screening test for trisomy 21, 18, 13 and sex chromosome aneuploidy in a pilot city in China

Characteristic

Total (n = 42,924)

GA at NIPT (weeks)

First trimester(6–13 weeks)

6471

Second trimester(14–27 weeks)

36,173

Third trimester(≥ 28 weeks)

218

Unknown

62

Maternal age (years)

< 30 years

20,137

30–34 years

13,647

35-39 years

7991

≥ 40 years

1144

Unknown

5

Pregnancy

Singleton pregnancy

42,257

Twin pregnancy

667

Advance maternal age (>35 years)

9135

  1. GA gestational age
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Human Genomics

ISSN: 1479-7364