More research on the sustainment of implemented evidence-based treatments in routine practice settings, such as community mental health centers (CMHCs), is needed. This study is the third and final phase-i.e., the Sustainment Phase-of a cluster-randomized controlled trial and focuses on CMHC providers' sustainment of the Transdiagnostic Intervention for Sleep and Circadian Dysfunction (TranS-C). The Sustainment Phase seeks to build on the two earlier phases of the trial-the Implementation Phase (NCT04154631) and Train-the-Trainer Phase (NCT05805657)-during which TranS-C was adapted to fit the CMHC context, and ten CMHCs were cluster-randomized to implement Standard TranS-C or Adapted TranS-C via facilitation and train-the-trainer. Data collection for the Sustainment Phase will commence at least three months after implementation efforts in partnering CMHCs have ended. Note that in this study, sustainment is operationalized per Shediac-Rizkallah and Bone's framework (1998) and defined as continued (a) activities, (b) benefits, and (c) capacity of an intervention after implementation efforts have ended.
Aim 1: Report the sustainment outcomes of TranS-C after implementation support has ended.
Aim 2: Evaluate whether manipulating fit to context predicts sustainment outcomes. It is hypothesized that providers in Adapted TranS-C will report better sustainment outcomes (i.e., activities, benefits, and capacity) relative to Standard TranS-C.
Aim 3: Test whether provider perceptions of fit-operationalized as acceptability, appropriateness, and feasibility-mediate the relation between treatment condition (Standard versus Adapted TranS-C) and sustainment outcomes. It is hypothesized that Adapted TranS-C, compared to Standard TranS-C, will predict better sustainment outcomes (i.e., activities, benefits, and capacity) indirectly through better provider perceptions of fit.