2.3. Feasibility – adherence, satisfaction, evaluation of the treatment's strengths and weaknesses, and adverse events

To assess adherence, the numbers of completed modules and homework assignment reports were measured. The numbers of messages between the participants and therapists were also measured.

In the intervention group, participants' satisfaction with treatment was assessed using the Client Satisfaction Questionnaire (CSQ-8) (Larsen et al., 1979) at post-treatment. The CSQ-8 contains 8 items and has a total score ranging from 8 to 32.

One month after treatment, the participants from both groups were interviewed via telephone. Adverse events were assessed through the question “Did the treatment have any negative effects?” Participants who answered yes were asked to expand upon this. They were also asked if the treatment had any positive effects and, if so, asked to expand upon this. Further, they were asked about their perceptions of the weaknesses and strengths of the treatment, if there was anything missing or if any part of the treatment was especially useful. Participants in the intervention group who had ended the treatment in advance were asked why they had done so.