Table 1.
Demographics of ABCD study participants and the subset included in the current analysis
| Variable | Release 3.0 baseline data (N = 11,878) | Survey 1 (N = 3,091) | Survey 2 (N = 3,193) | Survey 3 (N = 2,934) |
|---|---|---|---|---|
| Age (years), mean (range) | 9.91 (9–11) | 12.86 (11–14) | 12.94 (11–14) | 13.05 (11–14) |
| Sex | ||||
| Female | 5,682 (47.8%) | 1,530 (49.3%) | 1,562 (48.9%) | 1,435 (48.9%) |
| Male | 6,196 (52.1%) | 1,561 (50.6%) | 1,631 (51.0%) | 1,499 (51.1%) |
| Racea | ||||
| White | 8,244 (69.4%) | 2,481 (80.2%) | 2,521 (78.9%) | 2,365 (80.6%) |
| Black | 1,895 (15.9%) | 213 (6.8%) | 267 (8.3%) | 216 (7.36%) |
| Asian | 498 (4.1%) | 170 (5.4%) | 172 (5.3%) | 168 (5.7%) |
| Multiracial/Multiethnic | 184 (1.5%) | 27 (0.8%) | 32 (1%) | 26 (0.8%) |
| Other | 852 (7.1%) | 167 (5.4%) | 168 (5.2%) | 128 (4.36%) |
| Unknown/Not reported | 205 (1.7%) | 34 (1.0%) | 33 (1.0%) | 29 (0.9%) |
| Ethnicity | ||||
| Hispanic/Latino | 2,411 (20.3%) | 512 (16.5%) | 523 (16.3%) | 457 (15.5%) |
| Not Hispanic | 9,314 (78.4%) | 2,545 (82.3%) | 2,638 (82.5%) | 2,446 (8.36%) |
| Unknown/Not reported | 143 (1.2%) | 33 (1%) | 34 (1%) | 31 (1%) |
| Parental education | ||||
| <High school diploma | 1,395 (11.7%) | 40 (1.2%) | 32 (1.0%) | 32 (1.0%) |
| High school diploma/GED | 330 (2.7%) | 174 (5.6%) | 182 (5.5%) | 160 (5.4%) |
| Some college | 3,080 (25.9%) | 615 (19.8%) | 673 (21.0%) | 587 (20.0%) |
| Bachelor's degree | 3,015 (25.3%) | 934 (30.2%) | 978 (30.6%) | 923 (31.4%) |
| Postgraduate degree | 4,044 (34.0%) | 1,325 (42.8%) | 1,323 (41.4%) | 1,230 (42.1%) |
| Unknown/not reported | 14 (0.1%) | 3 (<0.1%) | 5 (<0.1%) | 2 (<0.1%) |
ABCD = Adolescent Brain Cognitive Development; GED = General Educational Development Test.
a
Categories for race for the ABCD cohort were defined as in Goldstone et al. 2020.