Psychometric evaluation of the Medication Adherence Scale in older Chinese patients with coronary heart disease.

Abstract Objectives To translate the Medication Adherence Scale (MAS) into Chinese and evaluate the psychometric properties of the Chinese version of MAS (C-MAS). Methods The study used a cross-sectional design. The performance of C-MAS was assessed among 170 older patients with coronary heart disease (CHD). The psychometric properties of C-MAS, including content validity, factor structure, hypothesized validity, and internal consistency, were tested. Results The content validity index of the C-MAS was 0.90. Three factors were identified using the principal component analysis. The Cronbach's α was 0.868 for the total scale and ranged from 0.703 to 0.941 for the three subscales of C-MAS. In addition, the construct validity of the C-MAS was confirmed to test the hypothesis. Conclusions The three-factor C-MAS has good validity and internal consistency in older Chinese patients with CHD. The C-MAS can be used to assess the knowledge, attitudes, and barriers related to medication adherence among this population.