From this, five study cohorts were organized with each cohort grouped in two: one group receiving CBT and the other one receiving ST. Data on all participants assessed at baseline, post-treatment, 3 month, and 12-month follow-up on measures of symptoms, mood, self-esteem, insight, social functioning, and hospitalizations by research assistants blind to treatment group were treated with importance and analysed utilising the general linear models (GLM) comparing outcomes (continuous variables) across time for the two treatment groups and also for categorical outcomes. Primary results of the study which centre on the beliefs as to the severity of voices and global auditory hallucinations were measured utilising the Psychotic Symptom Rating Scales for auditory hallucinations (PSYRATS) and the Belief about Voices Questionnaire—Revised (BAVQ-R), while the secondary outcomes which include psychotic symptoms, self-esteem, social functioning, insight, depression, and hospitalization were measured through interview and self-report utilising Social Functioning Scale (SFS); the Beck Depression Inventory II (BDI-II); the Rosenberg Self-Esteem Scale (RSES); and the Beck Cognitive Insight Scale (BCIS).
Results of the study indicate that both interventions are beneficial although on different outcomes: Enhanced ST was specifically effective in reducing auditory hallucinations, while group CBT was found specifically effective in reducing general psychotic symptoms. The inconsistency of these results with other recent group CBT studies – Barrowclough et al. (2006), Bechdolf et al. (2004) nor Wykes et al. (2005) – may be attributed to the basic differences of the participants in this study from those previous current studies which may have resulted to differences in a number of variables. More importantly, although enhance ST and group CBT have proven effective in different outcomes, the positive impact of enhanced ST on beliefs about auditory hallucinations