Explanation for the choice of comparators {6b}
We chose to have a waiting list control condition as the comparator because there are no standard preventive interventions for the specific target group of this study to which the full RNT-focused intervention and the concreteness training intervention could be compared to. In addition, as the study investigates an intervention aimed at prevention, it is crucial to have a control condition representing the symptom development without any intervention provided. Participants in the waiting list control condition will be offered the option to download one of the two app-based interventions and use them for 6 weeks after they completed the study.