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Correlation between serum S100A8/A9 level in patients with active IgA vasculitis at onset of disease and other biomarkers of inflammation: (a) C-reactive protein (log-transformed) (R2 = 0.1030, p = 0.0076); (b) ferritin (R2 = 0.1143, p = 0.0077); (c) C3 component of complement (R2 = 0.1294, p = 0.0065); (d) fibrinogen (R2 = 0.1408, p = 0.0019); (e) erythrocyte sedimentation rate (log-transformed) (R2 = 0.0488, p = 0.0725).
