Validity and Reliability of the Turkish Version of the 8-Item Morisky Medication Adherence Scale in Patients With Type 2 Diabetes

Abstract

Objective: Diabetes mellitus (DM) is a common disorder that causes undesirable medical and economic consequences. A simple, reliable, and validated self-report instrument could provide a better understanding of non-adherence to treatment and may help identify new treatment modalities. Thus, the eight-item Morisky Medication Adherence Scale (MMAS-8) was developed. The aim of this study was to evaluate the validity and reliability of the MMAS-8 among Turkish diabetes mellitus patients. Methods: This cross-sectional descriptive study enrolled 199 patients. The Turkish translation of the Morisky-8 item scale consisted of forward translation, reconciliation, back translation, back translation review, developer review, pilot testing, and final translation. Results: Cronbach’s alpha test of internal consistency was calculated at alpha=0.890 for the eight items of the MMAS-8 scale. CFA demonstrated the scale fitted CMIN/DF=1.194, GFI=0.970, CFI=0.995, RMSEA=0.031. Poor glycemic control (HbA1c