Validity evidence of adapted hausa version of 8-item Marisky Medication Adherence Scale in patients with hypertension in North Western Nigeria
Adherence to antihypertensive medication is the cornerstone for achieving hypertension control. Morisky Medication Adherence Scale (MMAS-8) is one of the most widely used reported medication adherence measures. The aim of this study was to examine the evidence of the validity of adapted Hausa MMAS in assessing adherence among hypertensive patients in North Western Nigeria. In a longitudinal interventional study of individuals with hypertension, self reported adherence to the antihypertensive drug treatment was measured using the Morisky Medication Adherence Scale consistency of the Morisky Medication Adherence Scale-8 with crobanch's alpha factorial validity was assessed by identifying the underlying components using principal component analyses (PCA). A total of 130 individuals completed the study. Cronbach’s alpha was 0.79. Two components were identified. One component comprised six items: stopping medication when hypertension is under control, stopping when feeling hassled about sticking to the prescription. The second component comprised two other items that were all related to forgetfulness. A significant relationship between MMAS and diastolic blood pressure control (t = 2.2; p = .030), (χ2 = 6.6; p = .036) was found. The MMAS sensitivity and specificity, with positive and negative predictive values were 36%, 77%, 64%, and 52% respectively. The results suggest that the adapted Hausa Morisky Medication Adherence Scale-8 is a two-dimensional scale assessing intentional (first component) and unintentional (second component) non-adherence to the antihypertensive drug treatment. The findings of this validation study indicate that the Hausa version of the MMAS is a reliable and valid measure of medication adherence among hypertensive patients in North-western Nigeria.
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