Table 2.
Characteristics of the participants in the Adolescent Brain Cognitive Development (ABCD) study (n = 9637).
| Mean | SD | |
|---|---|---|
| Age | 9.9 | 0.6 |
| Body mass index | 18.8 | 4.0 |
| WISC-V Matrix Reasoning Total Score | 9.9 | 3.0 |
| Physical symptoms (CBCL) | 1.5 | 2.0 |
| n | % | |
| Sex | ||
| Female | 4586 | 47.6 |
| Race/ethnicity | ||
| White | 4976 | 51.6 |
| Black | 1416 | 14.7 |
| Hispanic | 2047 | 21.2 |
| Asian | 210 | 2.2 |
| Other | 976 | 10.1 |
| Missing data | 12 | 0.1 |
| Highest parental education | ||
| <High School Diploma | 482 | 5.0 |
| High School Diploma/GED | 938 | 9.7 |
| Some College | 2517 | 26.1 |
| Bachelor | 2400 | 24.9 |
| Post Graduate Degree | 3289 | 34.1 |
| Missing data | 11 | 0.1 |
| Annual household income | ||
| Low (<$50,000) | 2669 | 27.7 |
| Middle (≥$50,000 to < $100,000) | 2509 | 26.0 |
| High (≥$100,000) | 3632 | 37.7 |
| Missing data | 827 | 8.6 |
Non-imputed data are shown.
CBCL the Child Behavior Checklist, SD Standard Deviation, GED General Educational Development, WISC-V the Wechsler Intelligence Scale for Children - Fifth Edition.