Table 1.
Correlations, means and standard deviations of the study variables.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1. Age | 1 | |||||||||||||
| 2. IQ | 0.01 | 1 | ||||||||||||
| 3. ADHD-RS Inatt. 1 | −0.04 | 0.03 | 1 | |||||||||||
| 4. ADHD-RS Hyperact. 1 | −0.39 ** | 0.01 | 0.51 ** | 1 | ||||||||||
| 5. BES affective 1 | 0.16 | −0.01 | −0.40 ** | −0.26 * | 1 | |||||||||
| 6. BES cognitive 1 | −0.10 | 0.06 | −0.23 | −0.19 | 0.34 ** | 1 | ||||||||
| 7. ADHD-RS Inatt. 2 | 0.09 | 0.14 | 0.54 ** | 0.24 | −0.17 | −0.20 | 1 | |||||||
| 8. ADHD-RS Hyperact. 2 | −0.17 | 0.07 | 0.39 ** | 0.61 ** | −0.12 | −0.14 | 0.64 ** | 1 | ||||||
| 9. BES affective 2 | 0.10 | −0.17 | 0.01 | 0.09 | 0.30 * | −0.15 | −0.27 * | −0.06 | 1 | |||||
| 10. BES cognitive 2 | −0.17 | −0.01 | −0.02 | 0.05 | −0.02 | 0.00 | −0.19 | −0.14 | 0.47 ** | 1 | ||||
| 11. Change Inattention | 0.13 | 0.14 | 0.00 | −0.04 | 0.06 | −0.09 | 0.83 ** | 0.51 ** | −0.25 * | −0.21 | 1 | |||
| 12. Change Hyperactivity | 0.08 | 0.07 | 0.10 | 0.00 | −0.02 | −0.02 | 0.63 ** | 0.78 ** | −0.15 | −0.22 | 0.68 ** | 1 | ||
| 13. Change BES affective | 0.06 | −0.17 | 0.14 | 0.18 | 0.00 | −0.26 * | −0.16 | −0.01 | 0.95 ** | 0.50 ** | −0.32 * | −0.15 | 1 | |
| 14. Change BES cognitive | −0.16 | −0.01 | −0.02 | 0.05 | −0.02 | 0.00 | −0.18 | −0.14 | 0.48 ** | 0.80 ** | −0.21 | −0.25 | 0.51 ** | 1 |
| Mean | 10.29 | 89.52 | 18.67 | 15.20 | 29.73 | 31.06 | 11.37 | 9.87 | 32.75 | 33.52 | 0 | 0 | 0 | 0 |
| SD | 2.84 | 10.43 | 4.90 | 6.77 | 4.98 | 4.19 | 5.08 | 5.92 | 3.39 | 3.00 | 4.26 | 4.66 | 3.23 | 3.00 |
IQ = intelligence quotient; ADHD-RS Inatt. 1 = ADHD-Rating Scale-Inattention subscale (T0); ADHD-RS Hyperact. 1 = ADHD-Rating Scale-Hyperactivity-Impulsivity subscale (T0); ADHD-RS Inatt. 2 = ADHD-Rating Scale-Inattention subscale (T1); ADHD-RS Hyperact. 2 = ADHD-Rating Scale-Hyperactivity-Impulsivity subscale (T1); BES affective 1 = Basic Empathy Scale-affective subscale (T0); BES cognitive 1 = Basic Empathy Scale-cognitive subscale (T0); BES affective 2 = Basic Empathy Scale-affective subscale (T1); BES cognitive 2 = Basic Empathy Scale-cognitive subscale (T1); Change Inattention = change in ADHD-RS Inattention subscale’s score after the six months of MPH treatment; Change Hyperactivity = change in the ADHD-RS Hyperactivity-Impulsivity subscale’s score after the six months of MPH treatment; Change BES affective = change in BES-affective subscale’s score after the six months of MPH treatment; Change BES cognitive = change in BES-cognitive subscale’s score after the six months of MPH treatment; Mean = mean of the above variables; SD = standard deviation of the above variable; SD = standard deviation. The means of all the change scores are equal to zero because they were calculated as residual changes, and the mean of residuals in OLS regressions is always equal to zero. * p < 0.05; ** p < 0.01.