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Background The Resilience Against Depression Disparities (RADD), a community partnered, randomized comparative effectiveness study, aimed to address mental health in Lesbian, Gay, Bisexual, Transgender, and Queer/Questioning (LGBTQ) racial/ethnic populations in New Orleans and Los Angeles. Objectives To describe engagement methods, lessons learned, and recommendations in engaging LGBTQ individuals and agencies throughout the RADD study. Methods RADD used a community partnered participatory research framework to engage LGBTQ community members and agencies. Observational and quantitative data were collected to describe engagement activities and study adaptations from October 2016 to May 2019. Results Our partnered approach resulted in multiple study adaptations. The principles of cultural humility, coleadership, and addressing health determinants were important to successful engagement with LGBTQ community members and study participants. We recommend maintaining cultural humility as the tenant of all research activities. Conclusions This project's engagement plan demonstrates that community-academic partnerships can be forged to create and modify existing study models for LGBTQ communities.

IntroductionDepression is the leading cause of adult disability and common among sexual and gender minority (SGM) adults. The current study builds on findings showing the effectiveness of depression quality improvement (QI) and delivery of cognitive behavioural therapy (CBT) skills provided by community health workers in reducing depression. Depression QI approaches across healthcare and social/community services in safety-net settings have shown improvements in mental wellness, mental health quality of life and depression over 12 months. Further, a randomised study showed improved depression among low-income racial/ethnic minorities enrolled in a CBT-informed resiliency class (Building Resilience and Increasing Community Hope (B-RICH)). The current protocol describes a comparativeness effectiveness study to evaluate whether predominantly low-income, SGM racial/ethnic minority adults randomised to a CBT-informed resiliency class have improvements in depressive symptoms over and above community-engaged QI resources and training only.Methods and analysisThe study approached three clusters of four to five programs serving predominantly SGM and racial/ethnic minority communities in the USA: two clusters in Los Angeles, California, and one in New Orleans, Louisiana. Clusters are comprised of one primary care, one mental health and two to three community agencies (eg, faith-based, social services/support, advocacy). All programs received depression QI training. The current study employed a community-partnered participatory research model to adapt the CBT-informed resiliency class, B-RICH+, to SGM communities. Study participants were screened and recruited in person from participating programs, and will complete baseline, 6- and 12-month survey follow-ups. Participants were depressed adults (8-item Patient Health Questionnaire ≥10; ≥18 years of age) who provided contact information. Enrolled participants were individually randomised to B-RICH+ or depression QI alone. Primary outcomes are depressive symptoms; secondary outcomes are mental health quality of life, mental wellness and physical health quality of life. Data collection for this study is ongoing.Ethics and disseminationThe current study was approved by the UCLA Institutional Review Board. Study findings will be disseminated through scientific publications and community conferences.Trial registration numberhttps://clinicaltrials.gov/ct2/show/NCT02986126