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Table 1 Basic characteristics of the 1048 twin pregnancies

From: Performance of non-invasive prenatal testing for foetal chromosomal abnormalities in 1048 twin pregnancies

Characteristic

Number of cases (n, %)

Maternal age

Median (years)

29

Range (years)

18–48

18–24 years

130 (12.4%)

25–29 years

455 (43.4%)

30–34 years

332 (31.7%)

 ≥ 35 years

131 (12.5%)

Gestational age

Median (weeks)

16

Range (weeks)

12–28

12–15 weeks

322 (30.7%)

16–19 weeks

670 (63.9%)

20–23 weeks

46 (4.4%)

24–27 weeks

9 (0.9%)

 ≥ 28 weeks

1 (0.1%)

Chorionicity

MCMA

9(0.9%)

MCDA

154 (14.7%)

DCDA

879 (83.9%)

Unknown chorionicity

6(0.6%)

Conjoined twins

0 (0.0%)

Type of pregnancy

Assisted pregnancy

318 (30.3%)

Natural pregnancy

730 (69.7%)

  1. Totals may not be 100% because of rounding
  2. MCMA, monochorionic monoamniotic twin; MCDA, monochorionic diamniotic twin; DCDA, dichorionic diamniotic twin