Open AccessReliability and validity of a self-reported measure of medication adherence in patients with type 2 diabetes mellitus in Korea
Author(s) -
Weon-Young Lee,
Jeongmin Ahn,
Jeung-Hee Kim,
Young-Joo Hong,
Seung Sae Hong,
Young Taek Kim,
Seok Hong Lee,
Donald E. Morisky
Publication year - 2013
Publication title -
journal of international medical research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.421
H-Index - 57
eISSN - 1473-2300
pISSN - 0300-0605
DOI - 10.1177/0300060513484433
Subject(s) - medicine , convergent validity , type 2 diabetes mellitus , diabetes mellitus , construct validity , medication adherence , reliability (semiconductor) , type 2 diabetes , physical therapy , face validity , gold standard (test) , internal consistency , clinical psychology , psychometrics , endocrinology , power (physics) , physics , quantum mechanics
Objective This study examined the psychometric properties of the Korean version of the eight-item Morisky Medication Adherence Scale (MMAS-8) to measure adherence to diabetes medication in patients with type 2 diabetes mellitus.Methods The English version of the MMAS-8 was translated into Korean and administered to patient with type 2 diabetes mellitus via face-to-face interviews, conducted by an independent interviewer. Patient characteristics and glycosylated haemoglobin (HbA 1c ) levels were assessed at the same clinic visit. A proportion of patients was randomly selected for 2-week test-retest reliability via telephone interviews. Convergent validity of the MMAS-8 against a four-item MMAS, correlations with HbA 1c levels and construct validity of the MMAS-8 were evaluated.Results In total, 317 patients were included; 70 completed the 2-week test–retest interview. Internal consistency reliability was moderate and test–retest reliability of the MMAS-8 was excellent, although a ceiling effect was detected. Good convergent validity was shown by the high correlation of the new scale scores with the original MMAS-4. A significant association was found between MMAS-8 scores and HbA 1c levels. Using glycaemic control as a gold standard, sensitivity was 74.1% and specificity was 38.3%. Explanatory factor analysis identified three dimensions of the scale.Conclusions In light of acceptable reliability and validity, the MMAS-8 is a simple and quick method for the assessment of medication adherence among patient with type 2 diabetes mellitus, in a busy clinic setting.