TABLE 1.
Descriptive statistic of 200 pregnant women recruited in this study.
| Features | Number | Percentage (%) |
| Ethnicity | ||
| Saudi | 199 | 99.5 |
| Other than Saudi | 1 | 0.5 |
| Maternal age (year) | ||
| 21–25 | 15 | 7.5 |
| 26–30 | 25 | 12.5 |
| 31–35 | 42 | 21 |
| 36–40 | 77 | 38.5 |
| More than 40 | 41 | 20.5 |
| Average age | 35.69 | − |
| Range | 21–48 | − |
| Gestational age at the time of NIPT (weeks) | ||
| 10–16 | 98 | 49 |
| 17–20 | 23 | 11.5 |
| More than 20 | 79 | 39.5 |
| Average gestational age | 19.14 | − |
| Range | 10–32 | − |
| Fetal DNA fraction (%) | ||
| 4–10% | 60 | 30 |
| 11–20% | 123 | 61.5 |
| More than 20% | 17 | 8.5 |
| Average fetal DNA fraction | 13.38 | − |
| Range | 4–31% | − |
| Gender | ||
| Male | 106 | 53 |
| Female | 93 | 46.5 |
| Sex determination failure | 1 | 0.5 |
| Previous history | ||
| Yes | 34 | 17 |
| No | 166 | 83 |
| Body mass index (kg/m2) | ||
| Under 18.5 kg/m2 | 3 | 1.5 |
| Normal weight (18.5–25) | 37 | 18.5 |
| Overweight (25–30) | 55 | 27.5 |
| Obese (over 30) | 105 | 52.5 |
| Average | 30.84 | − |
| Range | 15–48 | − |