Reliability and validity of the Turkish version of the medication practical barriers to adherence questionnaire in patients with chronic diseases

The aim of this study was to evaluate the validity and reliability of the Turkish version of the Medication Practical Barriers to Adherence Questionnaire (MPRAQ-TR).

This is a validation study conducted between August 2022 and March 2023 in the ambulatory services of a secondary care private hospital located in Istanbul, Türkiye, among patients (18 years of age and older) with chronic diseases. After the Turkish translation and cultural adaptation of the MPRAQ, and a pilot think-aloud study, the following psychometric properties were assessed: internal consistency by calculating the Cronbach’s alpha coefficient, 2-week test-retest reliability, convergent validity by calculating Spearman’s rank correlation between the MPRAQ-TR and the Turkish version of Medication Adherence Report Scale (MARS), and predictive validity by evaluating the association between the MPRAQ-TR score and nonadherence to medications.

Among the 380 patients (response rate = 89.6%), 72.1% were nonadherent to their medications. The intraclass correlation coefficient was 0.99 for MPRAQ-TR scores (95% CI, 0.98–0.99; p < 0.001). The Cronbach’s alpha of the MPRAQ-TR was 0.853. There was a moderate negative correlation between the scores on the MARS and the MPRAQ-TR (Spearman’s rho = − 0.525; p < 0.01), supporting the convergent validity of the MPRAQ-TR. In the univariate analysis, the total score of MPRAQ-TR was associated with increased odds of nonadherence to medications (p < 0.01).

MPRAQ-TR shows good psychometric properties and can be used to evaluate the practical adherence barriers of patients with chronic diseases.