Procedures
traumas, PTSD, Trauma
RECRUITMENT
The recruitment of participants began in 2018 at Karakter, with a break in 2020 due to COVID-19. The recruitment is ongoing and is expected to be completed by 2024. All adolescents referred to Karakter sent a brief screening questionnaire called the Child Trauma Screening Questionnaire (CTSQ) [After the CAPS-CA interview, the diagnostic results are discussed with the research team and treatment team of the MARS-study. A conclusion is drawn regarding whether the inclusion criteria for PTSD due to multiple interpersonal traumas are met. An advisory consultation will be scheduled with the participants and parents/guardians if the inclusion criteria are met. During this consultation, the participant is informed about their participation in the treatment study, informed consent is reviewed, and an information sheet about the study is provided. After the advisory consultation, the adolescents and parents/guardians have two weeks to decide whether to participate in the study. If the adolescents and their parents/guardians agree to participate, the randomization procedure is initiated, and a treatment provider is assigned within three weeks. The MARS-study requires written informed consent from both parents and adolescents. In addition, general practitioners are informed through postal letters.