Detecting changes in patient treatment satisfaction with medicines: the SATMED-Q.

Javier Rejas, Miguel Ruiz, Antonio Pardo, Javier Soto

Health Economics and Outcomes Research Department, Pfizer, S.L.U., Alcobendas, Madrid, Spain. javier.rejas@pfizer.com

Value in health : the journal of the International Society for Pharmacoeconomics and Outcomes Research 2013 Jan-Feb

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The Treatment Satisfaction with Medicines Questionnaire (SATMED-Q) has shown appropriate psychometric properties exploring patients' satisfaction with treatment. Responsiveness (sensitivity to change) and known-group validity, however, still remained unknown. Thus, the goal of this study was to explore such psychometric properties for the SATMED-Q. We used data from a 6-month prospective study carried out in pain clinics, which included patients with chronic refractory pain of neuropathic origin who needed a change in their therapies. Sensitivity to change was assessed by comparing changes in the total and domain scores between baseline and end-of-trial visits according to patients' response criterion: pain reduction 50% or more (responder). Also, correlations between changes in pain intensity and satisfaction scores were computed. Known-groups validity was explored by comparing the degree of satisfaction between groups of different levels of pain. The sample was formed with 728 subjects (57.8 years, 61.0% women). After changing their therapy, 47% of the patients were considered responders, and pain intensity was reduced by an average of 42.9%±32.4% (P<0.001), which was significantly correlated (r =-0.524, P<0.001) with total treatment satisfaction improvement. The total score in the SATMED-Q was significantly higher in responders than in nonresponders: 80.9 (79.6-82.3) versus 66.5 (65.0-98.0) (P<0.001). Also, the instrument showed different scores of satisfaction according to different degrees of pain (mild, moderate, severe), F = 116.8 (P<0.001) in the total composite score and domains. The SATMED-Q was sensitive to changes in patients' satisfaction with treatment. In addition, patients' different heath statuses are correlated with different levels of satisfaction with treatment. Copyright © 2013 International Society for Pharmacoeconomics and Outcomes Research (ISPOR). Published by Elsevier Inc. All rights reserved.

Citation

Javier Rejas, Miguel Ruiz, Antonio Pardo, Javier Soto. Detecting changes in patient treatment satisfaction with medicines: the SATMED-Q. Value in health : the journal of the International Society for Pharmacoeconomics and Outcomes Research. 2013 Jan-Feb;16(1):88-96