From: Factors affecting cell-free DNA fetal fraction: statistical analysis of 13,661 maternal plasmas for non-invasive prenatal screening
Median
Std. deviation
Minimum
Maximum
Fetal fraction (%)
12.65
4.88
4.01
49.12
Gestational age (weeks)
17.00
3.92
11.00
37.00
Maternal BMI (kg/m2)
22.00
3.18
14.00
45.00
Maternal age (years)
32.00
5.50
18.00
50.00