Objective: To find out correlation between disease activity scores of Rheumatoid arthritis (RA), shedding light on significance of each disease activity score. Patients and methods: It is a cross sectional comparative study. The study was carried out at Rheumatology department, Fauji Foundation Hospital Rawalpindi, Pakistan over a period of six months. 240 patients (33 males, 203 females) aged [Formula: see text]18 years diagnosed as RA according to ACR 2010 criteria, were selected. We recorded demographics, details of RA, laboratory value (baseline chemistry, acute phase reactants, and RA serology), comorbidities, DAS 28 ESR, DAS 28 CRP, CDAI, SDAI and RAPID 3 of all the patients. Analysis was performed using Statistical Package for Social Sciences (SPSS) version 23. Pairwise correlation between the disease activity indices was assessed by Spearman’s log-rank analysis. Results: Median age of the study population was 53 years (range 20-87 years). Duration of RA in study population was 8 years (IQR= 4-15). Twenty-two patients (9.6%) had early RA, whereas 208 patients (90.4%) had established RA. ESR was raised in 163 (70.9%) of the RA patients. Methotrexate was the most common disease modifying drug, which was being used by 180(77.9%) patients. All the disease activity scores showed a significant correlation on bivariate spearman’s analysis. Although the strength of the correlation varied. Disease activity by DAS-28 ESR was most strongly correlated with CDAI. Disease activity assessment via RAPID-3 had the highest correlation with CDAI. There was a fair correlation of RAPID-3 with DAS-28 and a weak correlation with SDAI. Disease activity, as assessed by CDAI and SDAI had a moderate correlation with each other. Conclusion: While all disease activity indices demonstrate agreement in clinical use, CDAI and RAPID-3 offer suitable alternatives to DAS28 in resource-limited settings.
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