Inclusive approaches to developing content valid patient-reported outcome measure response scales for youth with intellectual/developmental disabilities.

An inclusive research approach can support the development of content valid PROM scales. We identified four broad strategies that supported youth co-researchers to engage in this response scale development process: universal design for learning, use of lived experiences, breaking down tasks, and peer support. Researchers may adopt and/or adapt the accessible inclusive research approaches described in this manuscript for measurement development and other research projects.