RESUMO
Background: Pervasive health and healthcare disparities experienced by transgender (trans) and gender diverse (TGD) people require innovative solutions. Peer-based interventions may address disparities, and are an approach endorsed by TGD communities. However, the scope of the literature examining peer-based interventions to address health and healthcare access inclusive of TGD people is uncharted. Aim: This scoping review aimed to understand the extent of the literature about peer-based interventions conducted with and/or inclusive of TGD populations; specifically, study participants (e.g. sociodemographics), study designs/outcomes, intervention components (e.g. facilitator characteristics), and intervention effectiveness. Methods: Underpinned by Arksey and O'Malley's framework: (1) identifying the research question; (2) identifying studies; (3) study selection; (4) charting data; and (5) collating, summarizing, and reporting results, eligible studies were identified, charted, and thematically analyzed. Databases (e.g. ProQuest) and snowball searching were utilized to identify peer-reviewed literature published within 15 years of February 2023. Extracted data included overarching study characteristics (e.g. author[s]), methodological characteristics (e.g. type of research), intervention characteristics (e.g. delivery modality), and study findings. Results: Thirty-six eligible studies documented in 38 peer-reviewed articles detailing 40 unique peer-based interventions were identified. Forty-four percent (n = 16/36) of studies took place in United States (U.S.) urban centers. Over half (n = 23/40, 58%) focused exclusively on TGD people, nearly three-quarters of which (n = 17/23, 74%) focused exclusively on trans women/transfeminine people. Ninety-two percent (n = 33/36) included quantitative methods, of which 30% (n = 10/33) were randomized controlled trials. HIV was a primary focus (n = 30/36, 83.3%). Few interventions discussed promotion of gender affirmation for TGD participants. Most studies showed positive impacts of peer-based intervention. Discussion: Although promising in their effectiveness, limited peer-based interventions have been developed and/or evaluated that are inclusive of gender-diverse TGD people (e.g. trans men and nonbinary people). Studies are urgently need that expand this literature beyond HIV to address holistic needs and healthcare barriers among TGD communities.