Table 1.
Descriptive characteristics of sample by age group
| % of Sample* | Age 3–6 n = 10447 |
Age 7–11 n = 16360 |
Age 12–16 n = 13732 |
Age 17–20 n = 5409 |
|---|---|---|---|---|
| Male | 80 | 80 | 79 | 78 |
| Race/ethnicity | ||||
| White | 49 | 54 | 56 | 60 |
| Black | 13 | 13 | 16 | 20 |
| Hispanic | 11 | 9 | 8 | 8 |
| Other | 26 | 24 | 19 | 12 |
| Psychiatric comorbidity | ||||
| ID | 14 | 22 | 31 | 44 |
| Schizophrenia/bipolar | 3 | 9 | 16 | 19 |
| Depression/anxiety | 4 | 9 | 14 | 17 |
| ADHD | 22 | 33 | 31 | 20 |
| Seizure | 6 | 8 | 9 | 12 |
| Medicaid eligibility | ||||
| Foster care | 6 | 7 | 10 | 7 |
| Poverty | 23 | 14 | 11 | 5 |
| Disability | 68 | 76 | 76 | 86 |
| Other eligibility category | 3 | 3 | 3 | 2 |
*
For each variable p value for the Chi-square test of overall differences in sample means between age groups was <0.001