Feasibility, test-retest reliability, and interrater reliability of the Modified Ashworth Scale and Modified Tardieu Scale in persons with profound intellectual and multiple disabilities

▶ Feasibility of the MAS and MTS for measuring muscle tone in persons with PIMD was good. ▶ The MAS had sufficient test-retest and interrater reliability in persons with PIMD. ▶ The MTS had an insufficient test-retest and interrater reliability in persons with PIMD. ▶ Further research should aim to examine the validity of the MAS.