Table 1 Patient characteristics of 9,176 singleton pregnancies undergoing NIPT for chromosomal aneuploidy

Total

9,176 (100.00)

Singleton pregnancy

9,176 (100.00)

Maternal age (years)

 Mean (± SD)

36.29 (± 3.63)

 Min–max

20–48

  < 35

2,605 (28.39)

  ≥ 35

6,571 (71.61)

Gestational age at NIPT (weeks)

 Mean (± SD)

12⁺³(± 1⁺³)

 Min–max

9⁺⁰–31⁺⁰

 9–12⁺⁶

7,913 (86.24)

 13–14⁺⁶

634 (6.90)

 15–19⁺⁶

601 (6.55)

  ≥ 20

28 (0.31)

BMI

 Mean (± SD)

22.21(± 3.28)

 Min–max

14.18–41.91

  < 18.5

738 (8.04)

 18.5–22.9

5367 (58.49)

 23.0–24.9

1463 (15.94)

 25.0–29.9

1317(14.35)

  ≥ 30

291 (3.17)

Method of conception

 Natural

6,773 (73.81)

 IVF

2,403 (26.19)