Table 1.
Participant Demographic Variables
| Variables | Controls | ADHD-PI | ADHD-C | df | X2 | p-values |
|---|---|---|---|---|---|---|
| Gender (% Male) | 44.26 | 50.00 | 65.00 | 2 | 4.24 | .12 |
| Race (% Caucasian) | 90.16 | 92.00 | 87.50 | 8 | 2.40 | .97 |
| M(SD) | M(SD) | M(SD) | df | F | p-values | |
| Age | 9.74(1.38) | 9.54(1.25) | 9.73(1.54) | 2, 148 | 0.33 | .72 |
| [9.39 – 10.09] | [9.19 – 9.90] | [9.23 – 10.22] | ||||
| Maternal Education | 5.61(1.02) | 5.75(0.97) | 5.13(1.73) | 2, 139 | 2.85 | .06 |
| [5.34 – 5.88] | [5.46 – 6.04] | [4.57 – 5.69] | ||||
| VCI | 104.87(11.60) | 99.60(12.78) | 100.98(15.54) | 2, 148 | 2.41 | .09 |
| [101.90 – 107.84] | [95.97 – 103.23] | [96.01 – 105.94] | ||||
| BASC-2 PRSa | 48.66(9.39) | 66.08(6.46) | 68.20(6.39) | 2, 148 | 102.44 | <.001 |
| Attention Problems | [46.25 – 51.06] | [64.24 – 67.92] | [66.16 – 70.24] | |||
| BASC-PRSb | 45.36(8.47) | 54.66(10.24) | 69.13(11.96) | 2, 148 | 67.19 | <.001 |
| Hyperactivity | [43.19 – 47.53] | [51.75 – 57.57] | [65.30 – 72.95] | |||
| BASC-2 TRSa | 46.51(8.40) | 59.40(9.69) | 63.69(8.15) | 2, 148 | 54.21 | <.001 |
| Attention Problems | [44.36 – 48.66] | [56.65 – 62.16] | [61.09 – 66.30] | |||
| BASC-2 TRSb | 45.50(7.32) | 51.80(9.41) | 65.50(13.01) | 2, 148 | 50.98 | <.001 |
| Hyperactivity | [43.62 – 47.37] | [49.13 – 54.48] | [61.34 – 69.66] | |||
Note.
a
Controls < ADHD-PI and ADHD-C
b
Controls < ADHD-PI < ADHD-C; Maternal Education: 5 = some college; VCI: Verbal Comprehension Index; BASC-2: Behavior Assessment System for Children, 2nd ed.; *** p < .001; 95% confidence intervals for the means are presented in brackets.