CRP and rheumatoid arthritis: Calibration curves and decision curve analysis (DCA) were subsequently used to validate the overall performance of the optimal model.<h4>Results</h4>Multivariate logistic regression analysis identified erythrocyte sedimentation rate (ESR)>54 mm/h, C-reactive protein (CRP)>32.83 mg/L, and SMI synovial blood flow grade III as independent predictors of clinically active RA.