Psychometric Properties of Persian Version of the 8-item Morisky Medication Adherence Scale in Type 2 Diabetes Patients
Published: August 1, 2019 | DOI: https://doi.org/10.7860/JCDR/2019/41408.13076
Mehran Nakhaeizadeh, Ali Khalooei
1. PhD Candidate in Biostatistics, Department of Biostatistics and Epidemiology, School of Public Health, Kerman University of Medical Sciences, Kerman, Iran.
2. Social Determinants of Health Research Centre, Institute for Futures Studies in Health, Kerman University of Medical Sciences, Kerman, Iran.
Correspondence
Ali Khalooei,
Department of Community Medicine, Kerman Medical School, 22 Bahman Blvd, Postal Code/P.O. Box: 7616914115, Kerman, Iran.
E-mail: dr_khalooei@yahoo.com
Introduction: The 8-items Morisky Medication Adherence Scale (MMAS-8) is a brief questionnaire that is applied to assess medication-taking behaviours.
Aim: To evaluate the validity and reliability of the Persian version of MMAS-8 among Type 2 Diabetes Mellitus (T2DM) patients in Iran.
Materials and Methods: A cross-sectional study was conducted among 589 T2DM patients in Kerman city (southeast Iran) from January to March 2017. Data were collected using MMAS-8 and diabetes self-management questionnaires. To check test re-test reliability and to determine the internal consistency Intra-class Correlation Coefficient (ICC) and Cronbach’s alpha method were employed. Also, convergent validity was assessed by correlation analysis method.
Results: Cronbach’s alpha and ICC of MMAS-8 were 0.75 and 0.88, respectively. The correlation coefficient between MMAS-8 and medication adherence subscale of diabetes self-management questionnaire was 0.85 (p<0.001). Exploratory Factor Analysis (EFA) showed two factors for MMAS-8. The first factor included items 1, 2, 3, 4, 6, and 8. Moreover, items 5 and 7 fell in the second factor. Confirmatory Factor Analysis (CFA) indices for modified MMAS-8 without Items 5 and 7 model (X2=9.3, DF=6, P=0.15, CFI=0.99, RMSEA=0.04, TLI=0.98, and NFI=0.98) were acceptable.
Conclusion: In this study, the Persian version of MMAS-8 was investigated to find out whether it is a reliable and valid scale for assessing medication-taking behaviours in T2DM patients. The results showed that it can be applied for Iranian diabetic patients by health care providers and researchers.
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