Mental health and post-school transitions for young people with Intellectual and Developmental Disabilities (IDD): A scoping review.

Young people with an Intellectual and Developmental Disability (IDD) often face ineffective and exclusionary post-school transition practices, leading to poor mental health in early adulthood. This scoping review aimed to map existing literature on mental health for young people with IDD during the post-school transition period including how IDD and mental health are characterised in this context and the extent to which community members with lived experience are included in the design and/or production of research. In collaboration with a co-researcher, we used the JBI framework and PRISMA guidelines in accordance with a published protocol. A tiered search was conducted in PsycINFO, Medline, ERIC, Web of Science, and Family and Society Studies Worldwide. The search identified 28 articles that met the inclusion criteria. Articles were published between 2011 and 2023 and conducted across four countries. Thirteen applied a quantitative study design, eight were qualitative, three used a mixed-methods design, and the remaining were reviews. Most articles focused on autism. The majority discussed mental health in terms of its impact on transitioning from school or as a co-occurring condition. There is a growing body of literature highlighting the challenges young people with disabilities face when transitioning from high school. However, there is a notable gap in the representation of diverse IDD populations and mental health emerged variably, often as an incidental finding rather than a primary focus.