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Sample demographics at initial visit
| Variable | AU | DS | TD |
|---|---|---|---|
| Sample size (n) | 23 | 29 | 56 |
| Number male | 21 | 19 | 28 |
| Age (months) (SD) | 30.8 (4.6) | 30.3 (4.9) | 18.1 (0.3) |
| Ethnicity (%) | |||
| European American | 83 | 79 | 79 |
| African American | 0 | 21 | 4 |
| Hispanic | 13 | 0 | 13 |
| Mixed, other | 4 | 0 | 4 |
| Parent college graduate (%) | 65 | 79 | 75 |
AU autism, DS Down syndrome, and TD typical development group
