부산대학교 도서관

Aim: To create a shortened, more user‐friendly Second Edition of the Dyskinesia Impairment Scale (DIS‐II) to assess dystonia and choreoathetosis, and evaluate its construct validity and reliability. Method: Scale development included an online expert meeting (n = 21) and iterative discussions within the research group (n = 6). A Rasch measurement model analysis on DIS scores from individuals with dyskinetic cerebral palsy or inherited/idiopathic dystonia (n = 123, 74 males, mean age 14 years, SD 5 years) was performed to evaluate the construct validity and reliability of the DIS‐II. Results: The DIS‐II 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‐of‐fit 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‐II can separate individuals into eight distinct ability levels. Interpretation: The DIS‐II provides valid and reliable measures for dystonia and choreoathetosis, and reduces the administration and scoring time compared with the DIS. The DIS‐II logit scores (interval level data) enhance comparison over time and between individuals in clinical practice and research. What this paper adds: Compared with the Dyskinesia Impairment Scale (DIS), the shortened edition (DIS‐II) requires half of the number of videos to be scored.The DIS‐II has a simplified rating scale, requiring scoring of 88 instead of 144 items.The DIS‐II has shown excellent reliability and good construct validity.The interval properties of the DIS‐II are superior to the ordinal level outcome measures of the DIS. [ABSTRACT FROM AUTHOR]