Table 1.
Baseline characteristics of ADHD screen positive and negative adolescents
| ADHD-SC+ (N = 2390) |
ADHD-SC- (N = 7302) |
|
|---|---|---|
| Age at completion 1 | 17.5 +/- 0.8 | 17.4 +/- 0.8 |
| Sex | ||
| Female | 1 423 (60%) | 3 742 (51%) |
| Male | 967 (40%) | 3 578 (49%) |
| Mothers’ education | ||
| Primary school (10 years or less) | 214 (9%) | 531 (7%) |
| Secondary school (11–13 years) | 752 (32%) | 2 277 (31%) |
| Higher education (13 + years) | 777 (33%) | 2 774 (38%) |
| Don’t know | 629 (27%) | 1671 (23%) |
| Fathers’ education | ||
| Primary school (10 years or less) | 231 (10%) | 527 (7%) |
| Secondary school (11–13 years) | 787 (33%) | 2 548 (35%) |
| Higher education (13 + years) | 648 (31%) | 2 424 (33%) |
| Don’t know | 350 (15%) | 1 737 (24%) |
| ASRS score | ||
| Mean score (+/- SD) | 48.3 +/- 11.1 | 29.5 +/- 10.8 |
| Number of ADHD symptoms (range: 0–18) | 9.3 +/- 3.0 | 3.3 +/- 2.6 |
| IN symptom score (range: 0–9) 1 | 6.0 +/- 1.7 | 2.0 +/- 1.8 |
| High level of IN symptoms | 1 756 (73%) | 528 (7%) |
| HI symptom score (range: 0–9) 1 | 3.3 +/- 2.0 | 1.3 +/- 1.4 |
| High level of HI symptoms | 496 (21%) | 190 (3%) |
| SMFQ score | ||
| Mean score (+/- SD) | 9.3 +/- 6.6 | 4.7 +/- 5.0 |
| Less than 12 | 1 557 (67%) | 6 437 (89%) |
| 12 or above | 789 (33%) | 780 (11%) |
| YCD - score of 1 or above | 733 (34%) | 1 265 (18%) |
| Deliberate self-harm | 350 (15%) | 395 (5%) |
| Familial history of self-harm or suicide attempt | 375 (16%) | 711 (10%) |
1 Mean +/- SD. ADHD-SC+:Screen positives for ADHD, ADHD-SC-: Screen negatives for ADHD, ASRS: Adult ADHD Self-Report Scale, IN: Inattention, HI: Hyperactivity / impulsivity, SMFQ: Short Mood and Feelings Questionnaire, YCD: The Youth Conduct Disorder scale