Table 1.
The distribution of the abnormal numbers of chromosomes that were identified by FISH and/or conventional karyotype analysis, as a function of maternal age
| Maternal age (years) | No. of pacients (%) | No. of aneuploidies detected by FISH /Conventional Cytogenetics | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Trisomy 21 | Trisomy 18 | Trisomy 13 | Trisomy X | Monosomy | Trisomy XYY | Trisomy XXY | Triploidy | Total | ||
| ≤20 | 5 (0.43) | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 1 |
| 21-25 | 53 (4.57) | 0 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 2 |
| 26-30 | 266 (22.95) | 5 | 1 | 0 | 1 | 0 | 2 | 0 | 1 | 10 |
| 31-35 | 400 (34.51) | 5 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 7 |
| 36-40 | 371 (32.01) | 6 | 0 | 0 | 1 | 0 | 0 | 1 | 0 | 8 |
| 41-45 | 64 (5.52) | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 |
| TOTAL | 1159 (100) | 18 | 4 | 0 | 3 | 1 | 2 | 1 | 1 | 30 |