Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
The Parental Origin and Stage of Nondisjunction Error Resulting in Trisomy 21 According to Parental Age
| Parental origin and stage of error | No. of cases (%) | Percentage of parental origin | Mean maternal age (years±SD) | Mean paternal age (years±SD) |
|---|---|---|---|---|
| Maternal | 93 | |||
| Meiosis I | 82 (86) | 31.06±6.69 | 34.52±7.11 | |
| Meiosis II | 13 (14) | 33.84±4.93 | 35.11±4.31 | |
| Paternal | 5 | |||
| Meiosis I | 4 (80) | 23±5.65 | 25.60±3.71 | |
| Meiosis II | 1 (20) | 27±0.0 | 29±0.0 | |
| Mitotic | 2 | 2 | 23.50±2.12 | 26±0.0 |
| Total cases | 102 |
SD, standard deviation.
