Influence of the mode of administration on the results of medication adherence questionnaires

• Type: Article in International Scientific Journal
• Date: 2017

Authors

Cabral, AC (Author) Other; Moura Ramos, M (Author) Other; Castel Branco, M (Author) Other; Caramona, M (Author) Other; Fernandez Llimos, F (Author) Other; Figueiredo, IV (Author) Other

Journal

Title: Journal of Evaluation in Clinical Practice

Vol. 23

Pages: 1252-1257

ISSN: 1356-1294

Publisher: Wiley-Blackwell

Indexing

ISI Web of Knowledge - 4 Citations

Scopus - 5 Citations

Other information

Authenticus ID: P-00N-CYD

DOI: 10.1111/jep.12773

Abstract (EN): Introduction and objectivesAdherence to medication regimen is commonly assessed through questionnaires, some of which are validated via self-administration. The inadequate health literacy of elderly people pushes researchers to the use of interviews as a method of administration. The aims of this study were to compare the results obtained with an interviewer-administered and a self-administered medication adherence questionnaire and to evaluate the consequences of the adherence status classification of individuals. MethodsA cross-sectional study was performed in which the Medida de AdesAo aos Tratamentos adherence questionnaire was administered to adult patients who were taking at least 1 antihypertensive drug. The data were collected in 7 community pharmacies in central Portugal between March 2014 and September 2015 in 2 different phases: in the first phase, the questionnaire was applied during a healthcare professional interview, and the second phase involved a self-report administration. A confirmatory factor analysis was conducted, and the measurement and structural invariances across the application methods were examined. ResultsA sample of 425 patients with a mean age of 68.2110.56years participated in the study. The confirmatory factor analysis revealed that both the interview and self-report had a good fit with the original model, although the self-report results exhibited a better fit. In the interview administration, we obtained lower values for skewness and higher levels of kurtosis. The patients subjected to the interview administration presented with a 9.7% higher tendency to answer never when compared with the self-administered application, which overestimated adherence. ConclusionsThe interview administration method induced bias that led to a higher percentage of never answers and a subsequent overestimation of adherence levels. Self-report administration should be preferred in the application of medication adherence questionnaires.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6