Table 2.

Participant characteristics.

Characteristic	Total population (N = 140,265)
Maternal age (years)	30.15 (15–53)
<25 years	11,122 (7.91%)
25–29 years	51,529 (36.64%)
30–34 years	58,002 (41.25%)
35–39 years	17,254 (12.27%)
≥40 years	2,358 (1.68%)
GA at NIPT (weeks)	16.64 (10–34)
First trimester (10–13 weeks)	4,709 (3.35%)
Second trimester (14–27 weeks)	135,386 (96.27%)
Third trimester (≥ 28 weeks)	24 (0.02%)
Unknown	146 (0.10%)
Singleton pregnancy	137,983 (98.12%)
Twin pregnancy	2,282 (1.62%)
IVF	5,823 (4.14%)

Data presented as mean (range) or n (%). GA, gestational age; IVF, in vitro fertilization.