Reliability and validity of the Turkish adaptation of medication adherence self-efficacy scale in hypertensive patients

Abstract: Background: Despite a lot of study related to medication adherence in hypertension, a major problem in research is the measurement of adherence. Aim: To evaluate the reliability and validity of the Turkish version of the Medication Adherence Self-Efficacy Scale (MASES) among hypertensive patients in an outpatient setting in Turkey. Methods: One hundred-forty adult patients, who are receiving medication for hypertension in the last one year, were included to study sample. MASES was translated using a back-translation technique, which includes the use of a panel of experts and interpreters to translate the items from the source language to the target language and then back-translate them to the source language. Psychometric evaluations of MASES-Turkish form were used construct validity; item analysis, principal component analysis and known group validity and internal consistency reliability (Chronbach's alpha) Results: Reliability coefficient of the Turkish adaptation of MASES was found 0.92, and item-total correlations ranged between 0.26 and 0.72. It was found that factor structure of the MASES-Turkish consisted with original instrument. Patients with uncontrolled hypertension had lower self-efficacy scores compared to those with normal blood pressure. © 2008 European Society of Cardiology.