“…The enhanced risk that externalizing psychopathology confers for depression among youth with ADHD may be due to the nature of the functional impairments they experience (see McCarty et al, 2008; Patterson & Stoolmiller, 1991), including impairment in academic, social, and family domains (Barkley et al, 2006; Gathje et al, 2008). Externalizing psychopathology leads to (Biederman et al, 2008; Burke et al, 2010), and often exacerbates, functional impairment in youth with ADHD (Booker et al, 2016; Wehmeier et al, 2010), which may lead to the development of depression (e.g., Patterson & Capaldi, 1990; Patterson & Stoolmiller, 1991). Depression commonly onsets during adolescence (Merikangas et al, 2010) and portends the continuity of depressive symptoms into adulthood (Weissman et al, 1999).…”