Pre-intervention

(n = 20)

Post-intervention

(n = 20)

t value

(df = 19)

p value

Age

9.72

(1.27)

9.89

(1.27)

Non-verbal

intelligence

27.35

(3.62)

28.45

(5.54)

1.37

0.186

Reading comprehension

17.90

(4.52)

18.30

(4.32)

0.801

0.433

Inattention

16.50

(5.61)

12.85

(5.83)

5.45

<0.001

Hyperactivity

/impulsivity

10.00

(6.32)

7.50

(6.17)

3.58

0.002

ODD

9.50

(5.58)

6.90

(5.51)

4.37

<0.001