TABLE 1.
Sample characteristics.
| Subsample for the analysis of interrater reliability (n = 45) | Total sample (N = 474) | |
| Age: mean (SD) | 9.2 (1.6) | 8.9 (1.5) |
| Male: n (%) | 34 (75.6) | 382 (80.6) |
| Diagnosis n (%) | ||
| No ADHD diagnosis | 1 (2.2) | 32 (6.8) |
| ADHD – combined type | 28 (62.2) | 208 (43.9) |
| ADHD – predominantly inattentive type | 14 (31.1) | 184 (38.8) |
| ADHD – predominantly hyperactive-impulsive type | 2 (4.4) | 50 (10.5) |
| Comorbidities n (%) | n = 454−465 | |
| Internalizing disorders: | ||
| – Anxiety | 2 (4.4) | 29 (6.4) |
| – Depression | 2 (4.4) | 15 (3.1) |
| Externalizing disorders: | ||
| – Oppositional defiant disorder | 23 (51.1) | 166 (36.6) |
| – Disruptive mood dysregulation disorder | 6 (13.3) | 40 (8.8) |
| – Conduct disorder | 5 (11.1) | 28 (6.2) |
| Other disorders: | ||
| – Obsessive-compulsive disorder | 1 (2.2) | 2 (0.4) |
| – Tic disorder | 4 (8.9) | 24 (5.2) |
| – Autism spectrum disorder | 0 | 2 (0.4) |
| Medication n (%) | n = 462 | |
| ADHD medication | 17 (37.8) | 150 (32.5) |
| Parents’ primary language n (%) | n = 458 | |
| German | 42 (93.3) | 429 (93.7) |
| Highest parents’ graduation n (%) | n = 455 | |
| Higher-track school | 24 (53.3) | 261 (57.4) |
| Vocational school | 2 (4.4) | 26 (5.7) |
| Medium-track school | 14 (31.1) | 123 (27.0) |
| Lower-track school | 4 (8.9) | 43 (9.5) |
Clinical diagnoses of ADHD and comorbid externalizing disorders were based on the semi-structured clinical interview ILF-EXTERNAL conducted with the parents. Further comorbid symptoms were assessed using a clinical diagnostic checklist. ADHD, attention-deficit/hyperactivity disorder.