Table 1.

Constructs with measures and points of assessment.

Construct (measures)	T0	T1	T2	T3	T4
Inclusion and exclusion criteria
Posttraumatic stress symptoms (CATS)	X	X	X	X	X
Diagnosis of PTSD (CAPS-CA 5)	X			X
Acute psychotic symptoms (Kinder-DIPS)	X
Acute suicidality (SITBI)	X
Alcohol use disorder (AUDIT)	X
Cannabis use disorder (CUDIT-R)	X
Living conditions	X			X
Recruitment capability and resulting sample characteristics
Sociodemographics		X
Help-seeking behaviour		X
Data collection procedures and outcome measures
Data collection (comprehensibility of items, stress associated with the assessments, time required for data collection)					X
Acceptability of the IMI and the study procedures
Attitudes towards IMIs in general (APOI)		X		X
Intervention adherence (engagement and acceptance)					X
Acceptability of the IMI				X
Acceptability of individual IMI sessions		After each online-session
Preliminary evaluation of participant responses to the IMI
Depressive symptoms (PHQ-9)		X	X	X	X
Anxiety symptoms (GAD-7)		X	X	X	X
Health-related quality of life (KIDSCREEN)		X	X	X	X
Posttraumatic cognitions (CPTCI-SF)		X		X
Treatment satisfaction (CSQ-I)				X
Evaluation of potential risks and possible negative effects
Suicidality (BDI-II item 09)			X	X	X
Potential negative effects of the IMI (NEQ)				X
(Serious) adverse events	X		X	X	X

Note: T0 = screening, T1 = baseline, T2 = mid-intervention, T3 = post-intervention, T4 = follow-up.