Table 1.

Maternal characteristics of pregnant women who underwent NIPT

Maternal age (years)	Cases (%)
< 30	17,449 (38.12%)
30 ≤ year ≤ 34	11,403 (24.91%)
35 ≤ year ≤ 39	14,353 (31.36%)
> 39	2568 (5.61%)
Gestational age at NIPT (weeks)
12–15	4853 (10.60%)
16–19	33,066 (72.24%)
20–23	6740 (14.72%)
24–26	1037 (2.27%)
> 26	77 (0.17%)
Clinical features
Advanced maternal age (age ≥ 35 years)	16,921 (36.97%)
High or critical risk of serological screening	19,820 (43.30%)
Foetal soft markers by B-ultrasound	503 (1.10%)
Increased NT	86 (0.19%)
Missed other screening opportunities	500 (1.09%)
No clinical indications	7943 (17.35%)