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Background: Movement Disorders - Childhood Rating Scale for age 4-18 (MD-CRS 4-18) is a tool aimed to evaluate movement disorders in developmental age, validated since 2008 and applied in the literature. Psychometric properties, including inter- and intra-reliability and construct validity have been evaluated over time on children and adolescents with different types of movement disorders., Aim: The aim of the study is to revise the Movement Disorders - Childhood Rating Scale 4-18 (MD-CRS 4-18 R) and evaluate its psychometric properties, compared to previous version of the scale, in dyskinetic cerebral palsy., Design: This is a measurement-focused study of video recorder sessions., Setting: Video session carried out inpatient and outpatient., Population: This measurement-focused study was carried out on a cohort of 57 participants with DCP (37 males; mean age 9 years and 6 months ±3 years and 8 months) evaluated through video-recorded sessions by experienced scorers using MD-CRS 4-18 and MR-CRS 4-18 R., Methods: Inter-rater reliability, intra-rater reliability of MD-CRS 4-18 and MD-CRS 4-18 R were performed., Results: This study supports the relevant contribution of MD-CRS 4-18 R to identify the severity of movement disorders in dyskinetic cerebral palsy, as indicated by the higher ICC values on Index II compared to previous MD-CRS 4-18 results. Standard Error Measurement (SEM) and Minimally Detectable Difference (MDD) of MD-CRS 4-18 R in DCP were all very low, with SEMs ranging from 0.01 to 0.02 and MDD from 0.03 to 0.06., Conclusions: Data obtained with MD-CRS 4-18 R are in accordance with previous scale on individuals with movement disorders due to different etiologies, tested with MD-CRS 4-18., Clinical Rehabilitation Impact: MD-CRS 4-18 R is able to verify natural history of the disease and represents a standardized clinical outcome measure in the evaluation and follow-up of children with DCP. Also MD-CRS 4-18 Revised form is a feasible tool, now easier to understand than the previous one, more available for incoming clinical trials.

Background: Movement Disorder-Childhood Rating Scales (MD-CRS) have been designed in two forms (0-3 and 4-18 years) to accurately evaluate various movement disorders in children., Aim: The aim of this study is to evaluate the MD-CRS reliability when used by clinicians and professionals of rehabilitation after a one-day training on scoring it., Design: This is a measurement-focused study of video-recorded sessions., Setting: Video session carried out inpatient and outpatient., Population: Children with different types of movement disorders., Methods: After brief training in scoring MD-CRS, five health professionals (a resident doctor, a child neurologist and three physical therapists) independently scored 40 patient videotapes, of children with movement disorders for inter-rater reliability. In addition, the resident doctor scored 80 videos of 40 patients evaluated twice for intra-rater reliability. Reliability was assessed by Intraclass Correlation Coefficient (ICC) and was calculated separately for the two forms of the scale and for each score (Index I, Index II and Global Index). Standard Error of Measurement (SEM) and Minimal Detectable Difference (MDD) were also calculated., Results: For both forms, inter-rater reliability of Global Index and Index I were good with an ICC ranged between 0.83 and 0.95. Instead, results of Index II were substantially moderate for both forms, with an ICC of 0.53 and 0.57, respectively. Intra-rater reliability for all Indexes in both forms was substantial or almost perfect, with values of ICCs ranging from 0.74 to 0.99. MDD values were between 0.05 and 0.17., Conclusions: MD-CRS 0-3 and MD-CRS 4-18 remain reliable clinical measurement tools for evaluation of movement disorders in developmental age when used by clinicians and professionals of rehabilitation after a specific short training., Clinical Rehabilitation Impact: MD-CRS 0-3 and MD-CRS 4-18 appear to be a promising outcome measurement tool in large scale studies with children and adolescents affected by various movement disorders either to verify natural history of the disorder or to plan pharmacological and/or surgical intervention programs.