Table 4 Changes in ADHD symptoms and WISC-III scores in the two age groups after MPH treatment for one year
|  | 6-8 years (N = 47) | 9-12 years (N = 56) | P value2 | |||
|---|---|---|---|---|---|---|
Item | Mean ± SD | Sig.1 | Mean ± SD | Sig.1 |  |  |
ADHDRS_total | −7.0 ± 6.9 | *** | −8.4 ± 6.6 | *** | 0.351 |  |
ADHDRS_inattention | −3.6 ± 4.0 | *** | −4.3 ± 3.5 | *** | 0.332 |  |
ADHDRS_hyperactivity | −3.5 ± 3.6 | *** | −4.0 ± 3.8 | *** | 0.526 |  |
CGI –S | −0.9 ± 0.7 | *** | −0.9 ± 1.0 | *** | 0.892 |  |
WISC-III | Â | Â | Â | Â | Â | Â |
Information | 0.4 ± 1.6 |  | 0.2 ± 1.6 |  | 0.695 |  |
Similarities | 1.1 ± 2.4 | * | −0.1 ± 1.4 |  | 0.013 | * |
Arithmetic | 0.1 ± 2.4 |  | 0.1 ± 1.5 |  | 0.996 |  |
Vocabulary | 0.5 ± 2.2 |  | 0.2 ± 1.6 |  | 0.545 |  |
Comprehension | 0.4 ± 1.7 |  | −0.5 ± 1.5 | * | 0.015 | * |
Picture completion | 0.7 ± 2.0 | * | 0.9 ± 2.1 | * | 0.753 |  |
Coding | −0.4 ± 3.0 |  | 0.4 ± 2.3 |  | 0.093 |  |
Picture arrangement | 0.5 ± 1.7 |  | 1.0 ± 2.0 | ** | 0.254 |  |
Block design | 0.3 ± 2.1 |  | 0.2 ± 1.9 |  | 0.962 |  |
Object assembly | 1.2 ± 2.0 | ** | 0.2 ± 2.1 |  | 0.048 | * |
Digit span | 0.7 ± 2.0 |  | 0.5 ± 1.9 |  | 0.770 |  |
Symbol search | −1.1 ± 2.8 |  | −0.2 ± 1.7 |  | 0.190 |  |
FIQ | 3.6 ± 7.0 | ** | 2.3 ± 7.8 | * | 0.367 |  |
VIQ | 2.6 ± 8.5 |  | 0.8 ± 5.7 |  | 0.280 |  |
PIQ | 2.8 ± 8.8 |  | 4.9 ± 9.2 | ** | 0.315 |  |
VCI | 2.2 ± 6.3 |  | −0.5 ± 5.8 |  | 0.066 |  |
POI | 3.4 ± 7.6 | * | 3.4 ± 7.2 | ** | 0.992 |  |
FDI | 0.3 ± 6.6 |  | 1.4 ± 7.0 |  | 0.616 |  |
PSI | −1.3 ± 11.8 |  | 1.1 ± 7.8 |  | 0.421 |  |