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Maternal and pregnancy characteristics (n = 320).
| Category | Genetic results (n) | |
|---|---|---|
| Abnormal | Normal | |
| Maternal age (years) | 30 (22–41) | 28 (16–43) |
| Median (Range) | ||
| Maternal age ≥35 y | 19 | 23 |
| Maternal age <35 y | 70 | 208 |
| Gestational age (weeks) a | 23 (17–36) | 25 (17–33) |
| Median (Range) | ||
| First-Trimester b | 19 | 12 |
| Second-/Third-Trimester b | 70 | 219 |
Gestational age of amniocentesis.
Gestational age of first discovery of fetal nasal bone abnormality.
