A randomized controlled trial of the Transdiagnostic Intervention for Sleep and Circadian dysfunction implemented via facilitation and delivered by community mental health providers: Improving the "fit" of psychological treatments by adapting to context.

Background: To determine if the use of theory, data and end-user perspectives to guide an adaptation of the Transdiagnostic Intervention for Sleep and Circadian Dysfunction (TranS-C) yields better outcomes and improves the "fit" of TranS-C to community mental health centers (CMHCs), relative to the standard version.

Methods: Ten counties in California were cluster-randomized by county to Adapted or Standard TranS-C. Within each county, adults who exhibited sleep and circadian dysfunction and serious mental illness (SMI) were randomized to immediate TranS-C or Usual Care followed by Delayed Treatment with TranS-C (UC-DT). Facilitation was the implementation strategy. The participants were 93 CMHC providers who delivered TranS-C (Standard = 30; Adapted = 63) and 396 CMHC patients (Standard = 74; Adapted = 124; UC-DT = 198). Patient assessments were completed at pre-treatment, post-treatment, and six months after treatment (6FU). Provider assessments were completed at post-training, mid-treatment, and post-treatment.

Results: TranS-C (combining Adapted and Standard), relative to UC-DT before delayed treatment with TranS-C, was associated with improvement from pre- to post-treatment in sleep disturbance ( = -10.91, < 0.001, = -1.52), sleep-related impairment ( = -9.52, < 0.001, = -1.06), sleep health composite ( = 1.63, < 0.001, = 0.95), psychiatric symptoms ( = -6.72, < 0.001, = -0.52), and overall functional impairment ( = -5.12, < 0.001, = -0.71). TranS-C's benefits for functional impairment and psychiatric symptoms were mediated by improvements in sleep and circadian problems. Adapted versus Standard TranS-C did not differ on provider ratings of fit and better fit did not mediate the relation between TranS-C condition and patient outcome.

Conclusions: TranS-C can be delivered by CMHC providers. Although Adapted and Standard TranS-C both fit the CMHC context, several advantages emerged for the adapted version.