Exploring change in cognitive-behavioral therapy for generalized anxiety disorder-A two-arms ABAB crossed-therapist randomized clinical implementation trial.

There is little evidence-based knowledge of how psychotherapists should handle both sudden gains and more gradual session-by-session changes, either in general or in individuals suffering from generalized anxiety disorder. Using an ABAB crossed-therapist randomized clinical implementation trial design ( Based on a 3-level hierarchical linear model, PFC implementation showed faster symptom reduction in worry over therapy (i.e., linear change) and a decelerated (quadratic) change until 12-month follow-up in comparison to the SOTA implementation. These findings provide clinically useful information about potential short-term and long-term effects of exploring occurring change in GAD populations. Randomized clinical implementation trial designs are a step forward allowing to experimentally investigate basic psychotherapeutic strategies in process-based psychotherapy. (PsycInfo Database Record (c) 2021 APA, all rights reserved).