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Table 1 Demographic characteristics of women who underwent NIPT and pregnancy characteristicsa

From: Whole genome non-invasive prenatal testing in prenatal screening algorithm: clinical experience from 12,700 pregnancies

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)
  1. aValues are median (range) or n (%)