All 261 eligible participants were approached between September 2012 and June 2015, of whom 89 consented to participate (CAT: 42; TAU: 47). The most common reasons for not participating were no interest, or not willing to participate in the interviews or tests. Participant flow is displayed in figure 1. Full-consenters (n = 89) and those who consented to baseline staffrated **data** (n = 22) differed only with regard to age; younger people were more likely to fully participate (t(109) = −2.291, P =.024). Additionally, participants who completed the trial showed lower levels of positive symptoms compared to non-completers (t(49) = −2.524, P = .014).