Baseline (T1) characteristics of the 10 participants in the DBT-based skills training_
| Variables | Value |
|---|---|
| Age (years), mean (SD) | 16.0 (1.0) |
| Gender, Males, n (%) | 6 (75%) |
| Ethnicity, No.(%) | White: 8 (80%) |
| Multiethnic: 2 (20%) | |
| Education: | |
| Secondary school, n | 5 |
| Upper secondary school, n | 5 |
| Pharmacological treatment | |
| Methylphenidate, n (%) | 10 (100%) |
| ADHD subtypeₐ, | |
| ADHD-C, n (%) | 7 (70%) |
| ADHD-IN, n (%) | 3 (30%) |
| a,bSNAP-IV-P inattention, median (IQR) | 2.0 (0.7) |
| a,bSNAP-IV-P hyperacticity/impulsivity, median (IQR) | 0.7 (0.8) |
| cGQL, median (IQR) | 70.0 (25.9) |
| a,dBRIEF-P (GEF), median (IQR) | 70.0 (7.8) |
| dBRIEF-SR (GEF), median (IQR) | 58.5 (12.5) |
| eBYI Anxiety Scale, median (IQR) | 66.5 (26.0) |
| eBYI Depression Scale, median (IQR) | 69.5 (29.3) |
| fFFMQ, median (IQR) | 3.2 (0.5) |
Primary and secondary outcomes for intention-to-treat analyses (N=10) at pre-treatment (T1), post-treatment (T2) and 12-week follow-up (T3)_
| Outcome measure | Pre-treatment Median | Post-treatment Median (Z) | Follow-Up Median (Z) | Pre-treatment to post-treatment | Pre-treatment to Follow-Up | Pre-treatment to post-treatment | Pre-treatment to Follow-Up |
|---|---|---|---|---|---|---|---|
| SNAP-IV-P inattention | 2.0 | 1.5 (−1.3) | 1.8 (−2.0) | .8 | .05 | .4 | .6 |
| SNAP-IV-P hyperactivity/impulsivity | 0.7 | 0.6 (−1.2) | 0.7 (−0.5) | .2 | 0.6 | .4 | .2 |
| GQL | 70.0 | 79.5 (−1.3) | 79.5 (−1.7) | .2 | .09 | .4 | .5 |
| BRIEF-P (GEF) | 70.0 | 69.0 (−1.6) | 67.0 (−2.1) | .1 | .04 | .5 | .7 |
| BRIEF-SR (GEF) | 58.5 | 55.0 (−1.3) | 54.5 (−2.0) | .2 | .05 | .4 | .6 |
| BYI Anxiety | 66.5 | 66.0 (−1.4) | 49.5 (−2.2) | .2 | .03 | .4 | .7 |
| BYI Depression | 69.5 | 51.5 (−1.3) | 51.5 (−2.4) | .2 | .02 | .4 | .7 |
| FFMQ | 3.2 | 3.2 (−1.1) | 3.2 (−1.2) | .3 | .2 | .3 | .4 |
Primary and secondary outcomes for treatment completers (N=8) at pre-treatment (T1), post-treatment (T2) and 12-week follow-up (T3)_
| Outcome measure | Pre-treatment Median | Post-treatment Median (Z) | Follow-Up Median (Z) | Pre-treatment to post-treatment | Pre-treatment to Follow-Up | Pre-treatment to post-treatment | Pre-treatment to Follow-Up |
|---|---|---|---|---|---|---|---|
| SNAP-IV inattention | 2.2 | 1.4 (−1.35) | 1.5 (−1.96) | .2 | .05 | .5 | .7 |
| SNAP-IV hyperactivity/impulsivity | 0.6 | 0.2 (−1.16) | 0.8 (−0.51) | .2 | 0.6 | .4 | .2 |
| GQL | 70 | 88 (−1.35) | 83 (−2.12) | .2 | .03 | .5 | .7 |
| BRIEF-P (GEF) | 71 | 69 (−1.57) | 67 (−2.1) | .1 | .04 | .6 | .7 |
| BRIEF-SR (GEF) | 58 | 50 (−1.33) | 50 (−1.96) | .2 | .05 | .5 | .7 |
| BYI Anxiety | 74 | 58 (−1.4) | 35 (−2.2) | .2 | .03 | .5 | .8 |
| BYI Depression | 79 | 63 (−1.26) | 51 (−2.38) | .2 | .02 | .4 | .8 |
| FFMQ | 73 | 75 (−0.42) | 77 (−0.28) | .67 | .78 | .15 | .1 |