Maternal age (years) |
32.6 (30.1-37.5) |
33.7 (30.6-37.8) |
33.6 (30.3-37.6) |
Weight (Kg) |
61.0 (53.9-72.3) |
64.0 (58.0-70.0) |
64.0
(55.3-70.0) |
Height (cm) |
160.5 (158.0-166.5) |
163.0 (158.0-169.0) |
162.0
(158.0-168.0) |
Body mass index (kg/m2) |
23.0 (20.0-27.8) |
23.9 (21.1-26.3) |
23.4 (20.8-26.9) |
Parity |
|
|
|
Nulliparous
|
19 (47.5)
|
33 (51.6)
|
52 (50.0)
|
Parous
|
21 (52.5)
|
31 (48.4)
|
52 (50.0)
|
Previous chromosomal abnormality |
2 (5.0) |
4 (7.8) |
7
(6.7) |
Gestational age at pre-NIPT ultrasound (weeks) |
10.5
(10.4-10.7) |
10.6 (10.4-10.9) |
10.6 (10.4-10.9) |
Conception |
|
|
|
Spontaneous
|
36 (90.0)
|
56 (87.5)
|
92 (88.5)
|
IVF
|
4 (10.0)
|
8 (12.5)
|
12 (11.5)
|
Crown-rump length (mm) |
39.4 (35.8-40.7) |
39.4 (36.0-41.6) |
39.4 (26.0-41.3) |
Oedema thickness ≤ 10+6 weeks (mm) |
3.2 (2.6-3.8) |
3.1
(2.5-4.1) |
3.1 (2.5-4.1) |
Nuchal translucency 11-13+6 weeks (mm) |
2.5 (2.2-3.0) |
2.4
(1.9-3.2) |
2.5 (2.0-3.1) |
High risk cell-free DNA test |
2/34 (5.9) |
5/51 (9.8) |
7/85
(8.2) |