Table 1 Demographic characteristics of women who underwent NIPT and pregnancy characteristicsa
Maternal characteristics | Samples (n = 12,700) |
|---|---|
Age, years | 34.4 (15.0;59.0) |
Under 20 | 65 (0.5) |
20–29 | 2209 (17.5) |
30–39 | 8478 (66.7) |
Above 40 | 1948 (15.3) |
Body mass index (BMI, kg/m2) | 24.5 (14.2;57.6) |
< 18.49 | 624 (4.9) |
18.5–24.99 | 7421 (58.4) |
25–29.99 | 2952 (23.3) |
> 30 | 1703 (13.4) |
Gestation at sampling | 14+1 ± 1+3 (11+2;24+3) |
11+0 to13+6 weeks | 6202 (48.8) |
14+0 to 20+6 weeks | 6464 (50.9) |
21+0 weeks and above | 33 (0.3) |
Type of pregnancy | |
Singleton | 12,512 (98.5) |
Twins | 165 (1.3) |
Vanishing twin | 23 (0.2) |
Type of conception | |
Spontaneous | 12,201 (96.1) |
Artificial reproductive technology | 499 (3.9) |
Result of prior screening tests | |
High risk (cut-off ≥ 1:100) | 502 (3.9) |
Intermediate risk (cut-off 1:101 – 1:2500) | 12,198 (96.1) |