“…The following six personal characteristics served as PSM matching keys: age group, sex, level of ID (dummy coded), challenging behaviour, mental health, and mobility. We chose these personal characteristics either because they are basic demographic variables (sex) or have been shown in previous research to relate to outcomes of interest such as choice (Stancliffe et al, 2011; Tichá et al, 2012), employment (Stancliffe et al, 2019), living arrangements (Stancliffe et al, 2011), loneliness (Stancliffe et al, 2007, 2009, Stancliffe et al, 2010), and socially inclusive community participation (Stancliffe al., in press). Importantly, age mirrors life history, with older participants having vastly different past access to education, employment, disability services and many other opportunities relative to younger people with intellectual and developmental disabilities.…”