European Journal of Therapeutics
Original Article

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


Department of Endocrinology and Metabolism, Niğde Ömer Halisdemir Research and Application Hospital, Niğde, Turkey


Department of Internal Medicine, Private Clinic, Adana, Turkey


Department of Biostatistics, Gaziantep University School of Medicine, Gaziantep, Turkey


Fielding School of Public Health, Center for Health Sciences University of California Los Angeles, USA

Eur J Ther 2020; 26: 47-52
DOI: 10.5152/eurjther.2020.19132
Read: 1970 Downloads: 672 Published: 20 March 2020

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<7) was significantly higher in the low-adherence group than in the high- and medium-adherence groups (p=0.001, LR=21.79). Approximately 94% of the low-adherence group patients were in the poor glycemic control group.

Conclusion: The MMAS-8 Turkish version was found to be a valid and reliable scale in diabetic patients. This self-reported scale could function as a screening tool in busy clinics to identify patients with low adherence to medication treatment. Moreover, the MMAS-8 Turkish version could help improve adherence and develop new treatment strategies.

How to cite: Sayiner ZA, Savaş E, Kul S, Morisky DE. Validity and Reliability of the Turkish Version of the 8-Item Morisky Medication Adherence Scale in Patients With Type 2 Diabetes. Eur J Ther 2020; 26(1): 47-52.

EISSN 2564-7040