The MARS-5 questionnaire is a valid and reliable self-report tool for measuring medication adherence across various health conditions, including hypertension.
AIMS: This study aimed to establish the psychometric properties of a questionnaire measure of patients' adherence to medications to elicit patients' report of medication use in a variety of clinical samples. The reliability and validity were assessed in patients with hypertension. Additional analyses were performed on other patient groups. METHODS: Using a cross-sectional study design, a 10-item version of the Medication Adherence Report Scale (©Professor Rob Horne) was piloted in two samples of patients receiving treatment for hypertension (n = 50 + 178), asthma (n = 100) or diabetes (n = 100) at hospital outpatient or community clinics in London and the south-east of England. Following principal components analysis, five items were retained to form MARS-5 (©Professor Rob Horne). Evaluation comprised internal reliability, test-retest reliability, criterion-related validity (relationship with blood pressure control) and construct validity (relationship with patients' beliefs about medicines). RESULTS: = 4.24, df = 1, P < .05). Construct validity with beliefs about medicines was demonstrated with higher adherence associated with stronger beliefs in treatment necessity and lower treatment concerns. CONCLUSIONS: The MARS-5 performed well on several psychometric indicators in this study. It shows promise as an effective self-report tool for measuring patients' reports of their medication use across a range of health conditions.
Chan et al. (Wed,) studied this question.
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