Who stays, who benefits? Predicting dropout and change in cognitive behaviour therapy for psychosis

Lincoln, Tania M.; Rief, Winfried; Westermann, Stefan; Ziegler, Michael; Kesting, Marie-Luise; Lüllmann, Eva; Mehl, Stephanie (2014). Who stays, who benefits? Predicting dropout and change in cognitive behaviour therapy for psychosis. Psychiatry research, 216(2), pp. 198-205. Elsevier 10.1016/j.psychres.2014.02.012

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This study investigates predictors of outcome in a secondary analysis of dropout and completer data from a randomized controlled effectiveness trial comparing CBTp to a wait-list group (Lincoln et al., 2012). Eighty patients with DSM-IV psychotic disorders seeking outpatient treatment were included. Predictors were assessed at baseline. Symptom outcome was assessed at post-treatment and at one-year follow-up. The predictor x group interactions indicate that a longer duration of disorder predicted less improvement in negative symptoms in the CBTp but not in the wait-list group whereas jumping-to-conclusions was associated with poorer outcome only in the wait-list group. There were no CBTp specific predictors of improvement in positive symptoms. However, in the combined sample (immediate CBTp+the delayed CBTp group) baseline variables predicted significant amounts of positive and negative symptom variance at post-therapy and one-year follow-up after controlling for pre-treatment symptoms. Lack of insight and low social functioning were the main predictors of drop-out, contributing to a prediction accuracy of 87%. The findings indicate that higher baseline symptom severity, poorer functioning, neurocognitive deficits, reasoning biases and comorbidity pose no barrier to improvement during CBTp. However, in line with previous predictor-research, the findings imply that patients need to receive treatment earlier.

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