Contribution of the factors to EuroQol 5 Dimensions in rheumatoid arthritis patients achieving low disease activity/remission with abatacept treatment: Post hoc subgroup analyses of the Japanese real-world observational ‘ORIGAMI’ study

Abstract

ABSTRACT Objectives To address improvements in quality of life, we analysed the relative contributions of factors to EuroQol 5 Dimensions (EQ-5D) in abatacept-treated rheumatoid arthritis patients in the Orencia® Registry in Geographically Assembled Multicenter Investigation (ORIGAMI) study. Methods Patients who were evaluable for disease activity through to  Week 52 in the ORIGAMI study were divided into those achieving Simplified Disease Activity Index-remission/low disease activity (remission/LDA; n = 178) and patients with moderate disease activity/high disease activity (MDA/HDA; n = 99). We compared the changes in EQ-5D and other outcomes through to Week 52. Focusing on the remission/LDA group, the contribution of each factor to the variance of EQ-5D at baseline and Week 52 was examined using analysis of variance. Results The remission/LDA group showed greater improvements than the MDA/HDA group in EQ-5D, Japanese Health Assessment Questionnaire, visual analogue scale for pain (Pain VAS), and patient’s global assessment (PtGA). In the remission/LDA group, factors significantly contributing to EQ-5D were sex, C-reactive protein, and Pain VAS at baseline, and PtGA and age at Week 52. Conclusions In rheumatoid arthritis patients who achieved remission/LDA during abatacept treatment, PtGA and age at Week 52 contribute to the variance of EQ-5D, suggesting that the identification of factors associated with PtGA may be important to address improvements in quality of life.