Cross-cultural adaptation and validation of a European Portuguese version of the 8-item Morisky medication adherence scale

Ana C. Cabral, Mariana Moura-Ramos, Margarida Castel-Branco, Fernando Fernandez-Llimos, Isabel V. Figueiredo

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Introduction and Objective: The 8-Item Morisky Medication Adherence Scale (MMAS-8) is one of the most widely used instruments to assess medication adherence, but a validated European Portuguese version of MMAS-8 does not exist. Our aim was to develop and validate a European Portuguese version of the MMAS-8. Methods: A process of translation and back-translation of the original MMAS-8 was performed. The questionnaire was administered in nine community pharmacies and one public hospital between March 2014 and September 2015. Adult patients taking at least one antihypertensive drug were invited to participate. A confirmatory factor analysis was performed and internal consistency, convergent validity and concurrent validity were examined. Results: A total of 472 patients were enrolled in the study. The mean MMAS-8 score obtained was 6.74±1.39. One hundred and thirty-two patients were classified as low adherers (28%), 181 (38.3%) as medium adherers and 159 (33.7%) as high adherers. For the factorial structure of the Portuguese version of the MMAS-8, the fit indices of the final model (chi-square [18] 48.465, p<0.001) are suggestive of very good fit, with comparative fit index 0.95, root mean square error of approximation 0.06 (90% confidence interval 0.04-0.08), and standardized root mean square residual 0.04, confirming that the construct tested was unidimensional. The Cronbach's alpha for all items was 0.60, and the translated version presents convergent validity and concurrent validity. Conclusion: A European Portuguese version of the MMAS-8 was created that maintained a similar structure to the original MMAS-8 and good psychometric properties.

Translated title of the contributionAdaptação cultural para português e validação da versão portuguesa do 8-item Morisky medication adherence scale
Original languageEnglish
Pages (from-to)297-303
Number of pages7
JournalRevista Portuguesa de Cardiologia
Volume37
Issue number4
DOIs
Publication statusPublished - Apr 2018
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2018 Sociedade Portuguesa de Cardiologia

Keywords

  • Medication adherence
  • Questionnaires
  • Validation

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