Table 1 Baseline characteristics of the 6239 pregnant women
From: Application value of NIPT for uncommon fetal chromosomal abnormalities
Age (years) | n (%) | Gestational weeks | n (%) | Number of pregnancy | n (%) | NT (mm) | n (%) | Prior screening tests | n (%) |
|---|---|---|---|---|---|---|---|---|---|
18–25 | 974 (15.6%) | 12–13+6 | 2051 (32.9%) | 1 | 2932 (47.0%) | 1–1.5 | 2807 (45.0%) | High risk | 659 (10.6%) |
26–35 | 3992 (64.0%) | 14–15+6 | 3160 (50.6%) | 2 | 2557 (41.0%) | 1.6–2.0 | 2745 (44.0%) | Low risk | 1247 (20.0%) |
36–44 | 1247 (20.0%) | 16–20+6 | 931 (14.9%) | 3 | 630 (10.1%) | 2.1–2.5 | 652 (10.4%) | Abnormal MoM | 368 (5.9%) |
> 44 | 26 (0.4%) | > 21 | 97 (1.6%) | > 3 | 120 (1.9%) | > 2.5 | 35 (0.6%) | Only NIPT | 3965 (63.5%) |