Support
Every week, participants in both interventions (W-iCBT and iCBT) received personalized written messages from a coach with feedback on the exercises. For the participants in the W-iCBT group, guidance was given on the CBT and work-focused modules simultaneously. The coaches, 8 in total, were master’s-level psychology students who were specifically trained to provide feedback according to a standardized manual. The feedback aimed to provide support and encouragement and to monitor homework assignments and adherence to the intervention. Treatment-as-usual was not only prohibited but also not encouraged during the trial. The coaches were requested to limit their support to 1 message and a maximum of 15 minutes of correspondence per week with 1 participant.