Objective: Fibromyalgia (FM) is a rheumatic disorder characterized by widespread bodily pain, tenderness at multiple sites, and fatigue. It has a major impact on the quality of life. However, there has been no report regarding the health-related quality of life (HRQOL) in Korean patients with FM. The objective of this study was to assess the HRQOL and the correlation among each measurement and to identify the predictors for HRQOL in Korean patients with FM.

Methods: The HRQOL and clinical parameters were assessed by Short Form Health Survey-36 (SF-36), EuroQol 5 Dimensions (EQ-5D), time trade off (TTO), standard gamble (SG), Centers for Epidemiologic StudiesDepression (CES-D), social support, self-efficacy scale, Fibromyalgia Impact Questionnaire (FIQ), and tender points, respectively, from 104 outpatients with FM.

Results: Of the 104 subjects, 99 (95.2 %) were women with mean (⁑SD) age of 49.2 years (⁑11.1). The mean (⁑SD) years of disease onset was 8.06 (⁑7.38). The mean (⁑SD) scores of SF-36 global, mental component summary (MCS) and physical component summary (PCS) were 41.6 (⁑19.8), 47.4 (⁑25.0), and 43.5 (⁑23.7), respectively. The SF-36 GH, PCS, MCS scores of FM patients were lower than that of healthy controls (p＜0.001). The mean (⁑SD) EQ-5D utility and visual analog scale (VAS) were 0.52 (⁑0.32) and 55.6 (⁑19.4). The mean (⁑SD) scores of the TTO and SG were 0.49 (⁑0.44) and 0.47 (⁑0.42). The mean (⁑SD)

scores of CES-D, self-efficacy scale, social support and social network were 16.0 (⁑10.2), 55.9 (⁑19.4), 2.37 (⁑0.27), and 2.07 (⁑0.58), respectively. The mean (⁑SD) scores of FIQ was 46.4 (⁑17.7). The FIQ total score was negatively correlated with the scores of SF-36 GH, MCS, PCS, EQ-5D utility and VAS, TTO, SG, social support, social network, and self-efficacy scale (r=⁣0.63, r=⁣0.60, r=⁣0.48, r=⁣0.59, r=⁣0.56, r=⁣0.32, r=⁣0.27, r=⁣0.25, r=⁣0.31, r=⁣0.54, respectively. all p's＜0.001), and positively correlated with the CES-D (r=0.67, p＜0.001). In multivariate models, the predicting variables of SF-36 GH and PCS were age, FIQ, and self-efficacy and the predicting variables of SF-36 MCS were income, FIQ, and social support.

Conclusion: These results suggest that the HRQOL in Korean patients with FM is lower than healthy subjects. In a simple correlation analysis, FIQ, CES-D, social support, and self-efficacy were meaningful variables correlated with HRQOL. In multivariate model, age, FIQ, and self-efficacy were independent variables correlated with HRQOL. Therefore, the efforts to improve HRQOL in Korean patients with FM should be designed to improve the self-efficacy and depression in addition to conventional approach.

Keywords: Health-related quality of life, Fibromyalgia, Short Form-36 (SF-36), EuroQol-5 Dimensions (EQ-5D), Fibromyalgia Impact Questionnaire (FIQ)