SH3BP2 and rheumatoid arthritis: None of the markers performed better than the covariates in separating OA from E-RA (Fig. 2A, Table S2), however CRPM was better than the covariates in separating OA from MS-RA with mean difference (SD) in AUC of 0.03 (0.01), p = 0.0098 (Fig. 2B, Table S3).