Table 2 Pre-adaptation of instruments

Pediatric symptoms checklist and daily impact questions: youth (PSC-Y) and caregiver (PSC-C) versions

Addition of five questions assessing the daily life impact (as in widely used behavioral screening questionnaires) [27,28,29]

Assemblage of elements from two scales adapted for adolescent use [30, 31]

Adaptation of questions on work to reflect local child/adolescent contexts

Instructions were simplified

Assembled from the ABCD questionnaires reflecting activities of interest within the Greek context [13, 14, 32,33,34,35,36]

Removed items concerning habits during the COVID-19 pandemic

Omission of 6 items on knowledge of available assistance and engagement in help-seeking behavior

Adaptations of the age of the portrayed children to suit both children and adolescents.

Addition of social workers on the list of professionals listed as options to mark probability of help-seeking behavior due to the cultural relevance of this speciality in Greece

Shortening of instructions and adaptation to online survey

Barriers to access to care evaluation (BACE)*

* adapted with the consent of King’s College London

Modified to a caregiver report on child/adolescent barriers to care (originally adult self-report)

Instructions shortened

Adaptation of questions on work to reflect child/adolescent contexts

Modified to reflect past use of services (versus ongoing use)

Exclusion of free-text sections on constructive feedback

Adaptation to a self-report version of practicing therapists to report their own interventions targeting only adolescents and young adults