Criterion Validity of the ARthritis Treatment Satisfaction (ARTS) Questionnaire
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ORIGINAL RESEARCH ARTICLE
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Criterion Validity of the ARthritis Treatment Satisfaction (ARTS) Questionnaire Patient Satisfaction with Treatment and Need for Switching Therapy Javier Rejas,1 Jordi Monfort,2 Miguel A. Campillo,2 Miguel A. Ruiz,3 Antonio Pardo3 and Javier Soto1 1 Health Outcomes Research Department, Medical Unit, Pfizer Spain, Alcobendas (Madrid), Spain 2 Department of Rheumatology, Hospital del Mar, Barcelona, Spain 3 Department of Social Psychology and Methodology, Universidad Auto´noma de Madrid, Madrid, Spain
Abstract
Background and objective: The ARthritis Treatment Satisfaction (ARTS) questionnaire specifically assesses patients’ satisfaction with osteoarthritis treatment. However, its usefulness is limited since its criterion validity is unknown. The goal of this research was to analyse the criterion validity of the questionnaire in order to identify a cut-off value able to differentiate patients who are satisfied and those who are unsatisfied with osteoarthritis treatment and to establish the possible need for switching therapy. Methods: We used responses to the ARTS questionnaire from outpatients with osteoarthritis included in an open-label, non-controlled, naturalistic, prospective switching therapy study. In addition, patients’ responses to two questions on satisfaction with treatment and osteoarthritis-related health status were recorded. Receiver operative characteristic (ROC) curve analyses with estimators of validity were determined. The correlation between responses to the ARTS questionnaire, the question regarding satisfaction with treatment, and the osteoarthritis-related health status assessment were also analysed. Results: A total of 1756 male and female subjects were enrolled in the study. ROC curve analysis identified a cut-off point of ‡61 points as optimal for the criterion validity estimators of sensitivity (0.86), specificity (0.83), and positive (0.87) and negative (0.81) predictive values. This threshold value was used to identify patients satisfied with treatment and patients with a need to switch therapy (k coefficient of agreement 0.68 and 0.66, respectively). ARTS questionnaire scoring correlated with satisfaction with treatment (p < 0.0001), and with patient (r = 0.655, p < 0.0001) and investigator (r = 0.565, p < 0.0001) health status assessments.
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Conclusion: The ARTS questionnaire was able to identify patients satisfied with treatment and those with a need to switch their osteoarthritis therapy.
Background Osteoarthritis is a chronic disease that frequently causes important functional limitations and diminishes patients’ quality of life.[1,2] Joint degeneration (often affecting the knee, hip or hand) results in pain related to joint mobility, with severe pain relapses. The prevalence of osteoarthritis is greater among older people. In Spain, about half of the population over 65 years of age have osteoarthritis or rheumatism; this percentage is even higher among women.[3] Current therapeuti
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