Acceptance of scientific assessments
Acceptance of scientific assessments at a given timepoint was defined to be present when participants filled out at least one questionnaire at the respective timepoint. The number of adolescents and parents filling out at least one questionnaire is presented in ratio to the number of adolescents still participating in the study at the given timepoint: At T1 pre-treatment, questionnaires were filled out by 32 adolescents (84% of 38 treatment beginners) and 31 parents (82%). At T2 during treatment, questionnaires were filled out by 19 adolescents (76% of 25 still participating adolescents) and 13 parents (52%). At T3, questionnaires were filled out by 20 adolescents (83% of 24 completers) and 13 parents (54%). At T4, 6 adolescents (25% of the 24 completers) and 5 parents (21%) filled out the online questionnaires.