Table 1.
Participant characteristics
| Demographic | Combined N = 468 | Males N = 321 | Females N = 147 | Statistic, p value |
|---|---|---|---|---|
| Age Myears (SDyears) | 12.20 (2.85) | 12.17 (2.91) | 12.28 (2.71) | 0.402 (0.688) |
| IQ Mean (SD) | 102.08 (18.18) | 102.34 (18.06) | 101.50 (18.49) | − 0.459 (0.647) |
| Race N (%) | χ2 = 4.27 (0.234) | |||
| White | 313 (66.9%) | 213 (66.4%) | 100 (68.0%) | |
| Black/African American | 11 (2.4%) | 6 (1.9%) | 5 (3.4%) | |
| More than one race | 57 (12.2%) | 35 (10.9%) | 22 (15.0%) | |
| Other | 57 (12.2%) | 44 (13.7%) | 13 (8.8%) | |
| Unknown | 30 (6.4%) | 23 (7.2%) | 7 (4.8%) | |
| Ethnicity N (%) | χ2 = 0.29 (0.590) | |||
| Non-Hispanic | 340 (72.6%) | 230 (71.6%) | 110 (75.8%) | |
| Hispanic | 73 (15.6%) | 47 (14.6%) | 26 (17.7%) | |
| Unknown | 55 (11.7%) | 44 (13.7%) | 11 (7.5%) | |
| Maternal education N (%) | χ2 = 1.56 (0.458) | |||
| Less than or some college | 104 (22.2%) | 66 (20.6%) | 38 (25.9%) | |
| Bachelor’s or associate’s degree | 125 (26.7%) | 89 (27.7%) | 36 (24.5%) | |
| More than bachelor’s or associate’s degree | 150 (32.1%) | 102 (31.8%) | 48 (32.7%) | |
| Unknown | 89 (19.0%) | 64 (19.9%) | 25 (17.0%) | |
| Paternal education N (%) | χ2 = 2.87 (0.24) | |||
| Less than or some college | 127 (27.1%) | 77 (24.3%) | 49 (33.3%) | |
| Bachelor’s or associate’s degree | 107 (22.9%) | 76 (23.7%) | 31 (21.1%) | |
| More than bachelor’s or associate’s degree | 130 (27.8%) | 90 (28.0%) | 40 (27.2%) | |
| Unknown | 104 (22.2%) | 77 (24.0%) | 27 (18.4%) |
*
p < 0.05