Primary outcome measures and progression criteria
RECRUITMENT
The feasibility study is primarily gathering data on the feasibility of conducting a future definitive RCT. The primary outcome measures (and progression criteria) are:Rate of successful recruitment (≥70% intended participants recruited).Rate of successful adherence (≥75% in ACT+TAU attend four or more sessions).Acceptability of the ACT intervention (qualitative interview themes and majority (≥75%) satisfied/very satisfied on 5-point Likert scale).Signal of efficacy (based on increased psychological flexibility following intervention).