type | Abnormal chromosome number (example) | detection rate (%) |
triploid | 8 | 16 |
45, X | 5 | 10 |
16-trisomic | 4 | 8 |
18-trisomic | 3 | 6 |
22-trisomic | 3 | 6 |
13-trisomic | 2 | 4 |
21-deficiency | 1 | 2 |
21-trisomic | 1 | 2 |
47, XXY | 1 | 2 |