Table 1 The details of 667 cases of chromosomal abnormalities
| Â | Numbers (n) | Frequency in 667 cases with chromosomal abnormalities (%) | Frequency in total cases (%) |
|---|---|---|---|
Numerical abnormalities | |||
Trisomy 21 | 38 | 5.5 | 3.0 |
Trisomy 13 | 24 | 3.6 | 1.9 |
Trisomy 18 | 12 | 1.8 | 1.0 |
Other autosomal trisomy | 343 | 51.2 | 27.3 |
Other autosomal aneuploidy | 20 | 3.0 | 1.6 |
45,X | 75 | 11.2 | 6.8 |
47,XXY | 4 | 0.6 | 0.3 |
Triploidy | 47 | 7.0 | 3.8 |
Hypotriploidy or hypertriploidy | 8 | 1.2 | 0.6 |
Tetraploidy | 19 | 2.8 | 1.5 |
Hypotetraploidy or hypertetraploidy | 2 | 0.3 | 0.2 |
Total | 592 | 88.8 | 47.3 |
Structural abnormalities | |||
Unbalanced structural abnormalities | 33 | 4.9 | 2.6 |
Balanced rearrangement | 5 | 0.7 | 0.4 |
Total | 38 | 5.7 | 3.0 |
Mosaic abnormalities | 37 | 5.5 | 3.0 |