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Developing an adherence in hypertension questionnaire short version: MUAH‐16

The Maastricht Utrecht Adherence in Hypertension (MUAH) questionnaire provides clinicians with information about the causes of a patient's poor adherence to antihypertensive drugs. In this study, the authors aimed to develop and validate a short version of the MUAH questionnaire. After an exploratory factor analysis, the number of MUAH items was reduced. The original MUAH questionnaire (model 1) was compared with the 16‐item MUAH short version (model 2). Next, this short version of MUAH (MUAH‐16) with all factors correlated (model 2a) was compared with the short version of MUAH with four subscales that contribute to a global factor of adherence (model 2b). Model 1 had a poor fit to the data (χ2269 = 663.41, P < .001, comparative fit index = 0.695, root mean square error of approximation = 0.06), and model 2 had a very good fit to the data (χ2100 = 171.07, P < .001, comparative fit index = 0.92, root mean square error of approximation = 0.04). When comparing model 2a with model 2b, the chi‐square difference of the model (Δχ22 = 4.06; P = .067) revealed that the fits of both models were not significantly different. These findings suggest that MUAH‐16 better represents a patient's adherence to antihypertensive medication than the original MUAH questionnaire.