Fig. 2
From: Plasma C4d as marker for lupus nephritis in systemic lupus erythematosus
C4d, C3, and C4 levels correlate with modified Systemic Lupus Erythematosus Disease Activity Index (SLEDAI). Correlation of C4d (a), C3 (b), and C4 (c) levels with modified SLEDAI (excluding scores for low levels of complement factors and/or anti-double-stranded DNA antibodies) in the cross-sectional study at higher disease activity. Significance and correlation coefficient (r s) were calculated using Spearman’s rank-order correlation test