Table 2.
Overview of all effects in the multilevel model
| γ | γ01 | γ10 | γ11 | γ02 | γ03 | γ04 |
|---|---|---|---|---|---|---|
| Variable | Group | Time | Group × time | Reinforcement | Group * reinforcement | Age |
| SSRT | B = 8.2 (16.2), p = 0.61 | B = 23.1 (12.6), p = 0.07 | B = −30.7 (16.1), p = 0.06 | B = −9.8 (14.3), p = 0.50 | B = −7.4 (18.9), p = 0.70 | B = −0.90 (0.55), p = 0.11 |
| Mean RT | B = −58.0 (49.1), p = 0.24 | B = 7.8 (32.5), p = 0.81 | B = 58.6 (40.8), p = 0.15 | B = 56.8 (40.4), p = 0.16 | B = −2.4 (53.2), p = 0.96 | B = 0.008 (1.66), p = 0.996 |
| RT Var. | B = −71.7, (14.2), p < 0.001*** | B = −23.0 (10.2), p = 0.03* | B = 36.1 (12.9), p < 0.01** | B = −33.9 (12.4), p < 0.01** | B = 24.1 (16.4), p = 0.14 | B = 0.13 (0.47), p = 0.79 |
| Omission errors | B = −1.40 (0.30), p < 0.001*** | B = −0.54 (0.20), p = 0.01* | B = 0.95 (0.26), p < 0.001*** | B = −0.18 (0.25), p = 0.48 | B = 0.38 (0.33), p = 0.25 | B = 0.004 (0.01), p = 0.72 |
| Choice errors | B = −0.18 (0.27), p = 0.50 | B = 0.11 (0.20), p = 0.58 | B = −0.29 (0.26), p = 0.27 | B = 0.07 (0.24), p = 0.78 | B = −0.34 (0.31), p = 0.28 | B = −0.001 (0.01), p = 0.23 |
SSRT stop-signal reaction time, RT reaction time, Var. variability. B (SE) represents the unstandardized estimate with its standard error, γ 01 the group effect at T2 without reinforcement, γ 10 the time effect in ADHD without reinforcement, γ 11 the interaction effect between group and time without reinforcement, γ 02 the reinforcement effect at T2 in ADHD, γ 03 the interaction effect of group and reinforcement at T2, γ 04 represents the effect of age in boys with ADHD at T2 receiving no reinforcement
* p < 0.05, ** p < 0.01, *** p < 0.001