Development of validated disease activity and damage indices for the juvenile idiopathic inflammatory myopathies: II. The childhood myositis assessment scale (CMAS): a quantitative tool for the evaluation of muscle function

Abstract

The CMAS demonstrated an acceptable range of observed scores, excellent convergent validity, and excellent inter- and intrarater reliability. The CMAS is validated to quantitatively assess muscle function in the areas of strength and endurance in children with idiopathic inflammatory myopathies. It can be used in routine clinical care as well as therapeutic trials.