Outcome | Evaluation | Progression criteria to controlled trial* |
Recruitment and eligibility |
| No criteria set |
| ≥9% interested in participating of total participant population | |
| No criteria set | |
| No criteria set | |
| No criteria set | |
Data collection |
| ≥70% answering all questions at all assessments |
| ≤10% per questionnaire | |
| No criteria set | |
Attrition |
| ≤30% ≤30% |
Resources needed to complete the study and the intervention | Length of time required for:
| No criteria set |
Participants’ adherence to intervention | Number of:
| ≥50% attending the video or telephone assessment session, completing the introductory chapter, five CBT modules and the ‘booster’ support session |
Participants’ use of the intervention | Number of:
| No criteria set |
E-therapists’ adherence to intervention |
| No criteria set |
Participants’ acceptability of intervention and data collection and exploration of mechanisms of impact |
| No criteria set |
| ≥70% of participants using the intervention reporting that it is helpful <1 participant reporting substantial negative consequences related to participation in the study and/or intervention |
*If one or more criteria are not met revisions should be considered before proceeding to a controlled trial.
CBT, cognitive–behavioural therapy.