“…Arguably, children with hfASD may underreport their irritability symptoms due to introspection difficulties, as proposed by Mazefsky, Kao, and Oswald (2011) who found low correspondence between a parental diagnostic interview and self‐reports of depression, anxiety and ADHD in youth with hfASD. Here, we measure irritability using the self‐ and parent‐reported Affective Reactivity Index (ARI; Stringaris, Goodman, et al., 2012), which was previously shown to be reliable in TD children (DeSousa et al., 2013; Mulraney, Melvin, & Tonge, 2014; Stringaris, Goodman, et al., 2012) and distinguished between children with SMD and healthy controls (Stringaris, Goodman, et al., 2012). We assess consistency of reporting and compare the symptom pattern of irritability in boys with hfASD to that of boys with severe irritability (SMD) and healthy controls.…”