Table 3. The results of prenatal diagnosis in the AMA women combined with other indications.
| Indications | n (%) | Number abnormalities | Structural abnormalities | CNVs |
|---|---|---|---|---|
| Ultrasonographic abnormalities | 58 (12.2) | 9 | 0 | 0 |
| History of adverse pregnancy | 119 (25.0) | 1 | 1 | 0 |
| Spouse chromosome abnormalities | 54 (11.3) | 0 | 4 | 0 |
| Assisted reproductive technology | 76 (16.0) | 0 | 0 | 0 |
| High risk of prenatal screening | 103 (21.6) | 97 | 1 | 1 |
| Twins | 62 (13.0) | 0 | 0 | 0 |
| Others | 4 (0.8) | 0 | 0 | 0 |
| Total | 476 | 107 | 6 | 1 |
AMA, advanced maternal age; CNVs, copy number variations.