Table 1.
Sample Demographics
| Typically-Developing (n = 152) | ADHD (n=107) | Infant (n=69) | |
|---|---|---|---|
| Age (years/weeks; mean (SD))a | 14.1 (1.3) | 14.0 (1.4) | 5.7 (1.6) |
| Sex (% male) | 55.9% | 72.3% | 51.5% |
| Annual Family Income (median range) | $75–100,000 | $50–75,000 | $100–199,000 |
| Median in lowest earning quartile | $50–75,000 | $25–35,000 | $50–75,000 |
| Median in highest earning quartile | $100–130,000 | $75–100,000 | $100–199,000 |
| Ethnicity (% Hispanic/Latinx) | 6.8% | 6.30% | 8.6% |
| Raceb | |||
| % American Indian/Alaskan Native | 4.2% | 0.9% | 3.0% |
| % Asian/East Indian | 5.9% | 5.4% | 12.1% |
| % Native Hawaiian/Pacific Islander | 2.5% | 1.8% | 6.1% |
| % Black/African American | 5.9% | 11.6% | 6.1% |
| % White | 98.3% | 94.6% | 86.4% |
| Current Stimulant Treatment | --- | 53.6% | --- |
| Lifetime History of Stimulant Treatment | 7.60% | 75% | --- |
| Birthweight (kg; mean (SD)) | --- | --- | 3.4 (0.5) |
| Family History Score (mean (SD)) | --- | --- | 0.06 (0.15) |
Note:
†
Adolescent sample age reported in years; infant sample age reported in weeks
‡
Sex assigned at birth is report; data on gender identity were not available for the Year of EEG data collection
§
Percentage of participants who identified with specific NIH race categories. Because some people endorsed more than one option, numbers may add to >100%.