(b) Characteristics of single-group studies: intervention

1st author (date)	Intervention	Intervention length	Therapist	Informants
Hesslinger (2002) [14]	ST-based DBT+mindfulness components	2 h/week, 13 weeks = 26 h	Psychotherapists trained in DBT	Self, objective
Morgensterns (2016) [42]	DBT (elements of acceptance, mindfulness, functional behavioral analysis, psychoeducation)	2 h/week, 14 weeks = 28 h	Two clinical psychologists who are trained in CBT+DBT experienced from previous study phases (T.H.) or had clinical supervision from the experienced group leader	Self
Zylowska (2008) [11]	MAP+psychoeducation	2.5 h/week, 8 weeks = 20 h+daily at-home practice	Experienced mindfulness instructor (D.W.)+ADHD researchers (L.Z. & S.S.)	Self, objective

Intervention: CBT = cognitive behavioral therapy; DBT = dialectical behavior therapy; MAP = mindful awareness program; ST = skills training.