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A Rasch measurement model analysis on DIS scores from individuals with dyskinetic cerebral palsy or inherited\/idiopathic dystonia (<jats:italic>n<\/jats:italic>\u00a0=\u00a0123, 74 males, mean age\u00a014\u2009years, SD\u00a05\u2009years) was performed to evaluate the construct validity and reliability of the DIS\u2010II.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The DIS\u2010II evaluates dystonia and choreoathetosis in action and rest in 11 body regions, with action items scored from 0 to 3 and rest items 0 to 2. The number of videos to record are reduced from 26 to 14 and the items to score are reduced from 144 to 88. Rating scale functioning, goodness\u2010of\u2010fit evaluation, principal component analysis, and targeting met the predefined quality criteria of the study and construct validity was therefore considered good. Furthermore, person reliability indicated that the DIS\u2010II can separate individuals into eight distinct ability levels.<\/jats:p><\/jats:sec><jats:sec><jats:title>Interpretation<\/jats:title><jats:p>The DIS\u2010II provides valid and reliable measures for dystonia and choreoathetosis, and reduces the administration and scoring time compared with the DIS. The DIS\u2010II logit scores (interval level data) enhance comparison over time and between individuals in clinical practice and research.<\/jats:p><\/jats:sec><jats:sec><jats:title>What this paper adds<\/jats:title><jats:p>\n<jats:list list-type=\"bullet\">\n<jats:list-item><jats:p>Compared with the Dyskinesia Impairment Scale (DIS), the shortened edition (DIS\u2010II) requires half of the number of videos to be scored.<\/jats:p><\/jats:list-item>\n<jats:list-item><jats:p>The DIS\u2010II has a simplified rating scale, requiring scoring of 88 instead of 144 items.<\/jats:p><\/jats:list-item>\n<jats:list-item><jats:p>The DIS\u2010II has shown excellent reliability and good construct validity.<\/jats:p><\/jats:list-item>\n<jats:list-item><jats:p>The interval properties of the DIS\u2010II are superior to the ordinal level outcome measures of the DIS.<\/jats:p><\/jats:list-item>\n<\/jats:list><\/jats:p><\/jats:sec>","DOI":"10.1111\/dmcn.15444","type":"journal-article","created":{"date-parts":[[2022,10,31]],"date-time":"2022-10-31T07:12:10Z","timestamp":1667200330000},"page":"683-690","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["The Dyskinesia Impairment Scale, Second Edition: Development, construct validity, and reliability"],"prefix":"10.1111","volume":"65","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8695-0095","authenticated-orcid":false,"given":"Inti","family":"Vanmechelen","sequence":"first","affiliation":[{"name":"Department of Rehabilitation Sciences  Bruges Belgium"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5626-7068","authenticated-orcid":false,"given":"Annika","family":"Danielsson","sequence":"additional","affiliation":[{"name":"Department of Women's and Children's Health Karolinska 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