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

Cabral, AC; Moura-Ramos, M; Castel-Branco, M; Fernandez-Llimos, F; Figueiredo, IV

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

Cabral, AC Moura-Ramos, M Castel-Branco, M Fernandez-Llimos, F

Figueiredo, IV

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Publication Type:: Journal Article
Citation:: Revista Portuguesa de Cardiologia, 2018, 37 (4), pp. 297 - 303
Issue Date:: 2018-04-01

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Field	Value	Language
dc.contributor.author	Cabral, AC	en_US
dc.contributor.author	Moura-Ramos, M	en_US
dc.contributor.author	Castel-Branco, M	en_US
dc.contributor.author	Fernandez-Llimos, F https://orcid.org/0000-0002-8529-9595	en_US
dc.contributor.author	Figueiredo, IV	en_US
dc.date.available	2017-09-24	en_US
dc.date.issued	2018-04-01	en_US
dc.identifier.citation	Revista Portuguesa de Cardiologia, 2018, 37 (4), pp. 297 - 303	en_US
dc.identifier.issn	0870-2551	en_US
dc.identifier.uri	http://hdl.handle.net/10453/131354
dc.description.abstract	© 2018 Sociedade Portuguesa de Cardiologia 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.	en_US
dc.relation.ispartof	Revista Portuguesa de Cardiologia	en_US
dc.relation.isbasedon	10.1016/j.repc.2017.09.017	en_US
dc.subject.classification	Cardiovascular System & Hematology	en_US
dc.subject.mesh	Humans	en_US
dc.subject.mesh	Cultural Characteristics	en_US
dc.subject.mesh	Translations	en_US
dc.subject.mesh	Aged	en_US
dc.subject.mesh	Portugal	en_US
dc.subject.mesh	Female	en_US
dc.subject.mesh	Male	en_US
dc.subject.mesh	Medication Adherence	en_US
dc.subject.mesh	Self Report	en_US
dc.title	Cross-cultural adaptation and validation of a European Portuguese version of the 8-item Morisky medication adherence scale	en_US
dc.type	Journal Article
utslib.citation.volume	4	en_US
utslib.citation.volume	37	en_US
utslib.for	1115 Pharmacology and Pharmaceutical Sciences	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Graduate School of Health
utslib.copyright.status	closed_access
pubs.issue	4	en_US
pubs.publication-status	Published	en_US
pubs.volume	37	en_US

Abstract:

© 2018 Sociedade Portuguesa de Cardiologia 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.

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http://hdl.handle.net/10453/131354