The ADI-R is a 93-item semi-structured diagnostic interview administered to caregivers, with a higher score indicating greater severity of ASD-related symptoms. The diagnostic algorithm is based on several selected items across three domains: social interaction, communication, and RRBs. Past and present mannerisms were measured using the following question items: 77, 77b, 78, and 78b, (former and latter numbers assess present and past mannerisms, respectively). The Korean-translated version of the ADI-R, which is approved by the publisher Western Psychological Services, was used [19]. The ADI-R and ADOS-2 are considered as the gold-standard diagnostic assessments; moreover, they allow even higher sensitivity and specificity when used together [25].
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