“…We identified 50 articles which fit our inclusion criteria of having original data, answering a key question about self-report in individuals with Down syndrome or intellectual disability, in humans, and reporting on more than five cases (Figure 1, Table S1). Rabinovitz, 2003;Verdugo-Alonso et al, 2017;Wigham et al, 2011;Wigham et al, 2014), mental well-being (Benavidez & Matson, 1993;Bond et al, 2019;Dagnan et al, 2008;Esbensen et al, 2005;Gordon et al, 2007;Hall et al, 2014;Haynes et al, 2013;Hermans et al, 2012;Kellett et al, 2015;Masi et al, 2002;Mileviciute & Hartley, 2015;Penketh et al, 2014;Stancliffe et al, 2014;Watson et al, 1988), and social well-being (Benromano et al, 2017;Bromley et al, 1998;Janeslätt et al, 2019;Johnson et al, 2014;Kellett et al, 2005;Kellett et al, 2015;Kramer et al, 2009;Liljenquist et al, 2019;Miller & Chan, 2008 2).…”