Table 1 Summary on fetal fraction and maternal characteristics of 13,661 women with singleton pregnancy undergoing NIPS in the studied population
| 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 |