Table 1 Clinical characteristics of the participants at baseline (study inclusion)

Mean age, years (SD)

15.9 (1.3)

15.8 (1.3)

Male patients (n [%])

21 (42.0)

22 (44.0)

Full-scale IQ (n [mean, SD])

44 (94.3[12.8])

42 (93.4[13.2])

Parent socioeconomic status (n [%])

38 (76)

37 (74)

Less than compulsory school or 1–2 years of high school (0–11 years)

13 (34.2)

6 (16.2)

Completed high school and 1 year of training after high school (12–13 years)

3 (7.9)

4 (10.8)

Academy university for up to four years (14–15 years)

15 (39.5)

15 (40.5)

Academy/ University for four years or more (16 years and more)

7 (18.4)

12 (32.4)

 Webster Stratton, Incredible years

10 (20)

6 (12)

 Cognitive behavioral Therapy (CBT)

2 (4)

1 (2)

 Routine Clinical Care^a

18 (36)

24 (48)

 Other^b

4 (8)

4 (8)

 Short psychoeducational intervention with patient and parents

33 (66)

32 (64)

 Short psychoeducational intervention with patient alone

24 (48)

29 (58)

 School collaborative meeting

47 (94)

48 (96)

 ADHD full day lecture

35 (70)

36 (72)

 Predominantly Combined

18 (36.0)

13 (26.0)

 Predominantly Inattentive

17 (34.0)

18 (36.0)

 Subtreshold ADHD

15 (30.0)

19 (38.0)

 ADHD medication

44 (88.0)

47 (94.0)

 Sleep medication

6 (12.0)

2 (4.0)

 Other psychopharmacological treatment

5 (10.0)

2 (4.0)

 Anxiety disorders

19 (38.0)

18 (36.0)

 Posttraumatic stress disorder

0 (0.0)

1 (2.0)

 Depressive disorder NOS/Dysthymic disorder

8 (16.0)

3 (6.0)

 Obsessive Compulsive Disorder

1 (2.0)

2 (4.0)

 Tics disorder or Tourette’s Disorder

4 (8.0)

5 (10.0)

 ODD/Disruptive behaviour disorder NOS

6 (12.0)

5 (10.0)

 Autism spectrum disorder (mild symptoms)

2 (4.0)

2 (4.0)

Learning Disorders, reading disorders or mixed (n [%])

8 (16.0)

10 (20.0)