Portuguese version of the Medication Adherence Report Scale (MARS-9): Validation in a population of chronic pain patients

• Type: Article in International Scientific Journal
• Date: 2019

Authors

Sampaio, R (Author) FMUP; Azevedo L (Author) FMUP; Dias C (Author) FMUP; Horne, R (Author) Other; Castro-Lopes J.M. (Author) FMUP

Journal

Title: Journal of Evaluation in Clinical Practice

Vol. 25

Pages: 346-352

ISSN: 1356-1294

Publisher: Wiley-Blackwell

Indexing

ISI Web of Knowledge - 10 Citations

Scopus - 10 Citations

Other information

Authenticus ID: P-00Q-3KT

DOI: 10.1111/jep.13098

Abstract (EN): Aim The aim of present study was to perform the translation, cultural adaptation, and validation of the Medication Adherence Report Scale (MARS-P9) for the European Portuguese language in a sample of chronic pain patients. Methods A Portuguese version of the nine-item MARS ((c) Professor Rob Horne) scale (MARS-P9) was constructed through a process of translation, back translation, and experts' panel evaluation. A total of 141 chronic pain patients were subsequently evaluated at four time assessments during a 1-year pain medication treatment. The protocol interview included the assessment of pain intensity and interference (BPI), clinical outcomes and quality of life (S-TOPS), and MARS-P9. Results The internal consistency coefficient was acceptable for the total scale (alpha = 0.84). Exploratory factor analysis revealed a two-factor structure (intentional and unintentional nonadherence) that explained 61% of the variance. Convergent and discriminant validity were demonstrated by correlations between MARS scores and pain interference (r = 0.180, P <= 0.01) and S-TOPS (r = 0.242, P <= 0.05). Conclusion MARS-P9 has been shown to be an adequate instrument for Portuguese researchers and clinicians to assess the pattern of adherence during the management of chronic pain.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7