Health-related quality of life and its association with disease activity/functional status in rheumatoid arthritis: A cross-sectional study from South India

Background: Rheumatoid arthritis (RA) is an autoimmune disease with chronic pain that gradually becomes incapacitating and negatively influences the health-related quality of life (HRQoL). This study estimates HRQoL in RA using the EuroQol five dimensions (EQ-5D) tool and its association with functional status and disease activity. Methods: RA patients (n = 320) aged above 18 years, visiting outpatient clinic at a tertiary care multispecialty hospital in south India were the study participants. Sociodemographic, clinical, and laboratory data were collected from them. EQ-5D-5L questionnaire and the EQ Global Health Visual Analogue Scale (EQ-VAS) were used to measure HRQoL. Disease activity was measured using Disease Activity Score-28 (DAS-28), and the Health Assessment Questionnaire (HAQ) was used to assess functional status. Pearson's correlation and multiple linear regression were used to measure association, and statistical significance was considered at p < 0.05. Results: The EQ-5D utility score was 0.54 +/- 0.36, pain and anxiety were the most affected domains, and the mean EQ-VAS was 63.05 +/- 18.54%. A moderate to high disease activity was present in 85% (DAS-28 > 3.2), and a severe functional disability in 32.8% (HAQ > 1.5) of study participants. The mean EQ-5D scores for RA patients were 0.78 (0.65-0.90) for no disease activity, 0.73 (0.65-0.80) for mild, 0.53 (0.32-0.74) for moderate and 0.47 (0.32-0.62) for high disease activity. In multiple linear regression analysis, HAQ and age independently predicted EQ-5D. Conclusion: RA significantly impacts HRQoL, and interventions focussing on pain and anxiety management are essential. The study's EQ-5D values could help estimate Quality Adjusted Life Years (QALY) while conducting economic evaluation studies in RA within an Indian context.