No validation study has previously been made for the Arabic version of the 8-item Morisky Medication Adherence Scale (MMAS-8((c))) as a measure for medication adherence in diabetes. This study in 2013 tested the reliability and validity of the Arabic MMAS-8 for type 2 diabetes mellitus patients attending a referral centre in Tripoli, Libya. A convenience sample of 103 patients self-completed the questionnaire. Reliability was tested using Cronbach alpha, average inter-item correlation and Spearman-Brown coefficient. Known-group validity was tested by comparing MMAS-8 scores of patients grouped by glycaemic control. The Arabic version showed adequate internal consistency (alpha = 0.70) and moderate split-half reliability (r = 0.65). Known-group validity was supported as a significant association was found between medication adherence and glycaemic control, with a moderate effect size (varphic = 0.34). The Arabic version displayed good psychometric properties and could support diabetes research and practice in Arab countries.

Ashur, S.T., et al., Reliability and known-group validity of the Arabic version of the 8-item Morisky Medication Adherence Scale among type 2 diabetes mellitus patients. East Mediterr Health J, 2015. 21(10): p. 722-8.

https://www.ncbi.nlm.nih.gov/pubmed/26750162