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Table 4: Correlation matrix. U = urine, MCP-1 = monocyte chemoattractant protein 1, IgM = immunoglobulin M, IL-6 = interleukin 6, IL-8 = interleukin 8, ANCA = anti neutrophil cytoplasmatic autoantibodies, CRP = C-reactive protein, BVAS = Birmingham vasculitis activity score. Markers measured in the urine are expressed in relation to U-creatinine (mmol/l). For statistics, the Spearman’s rank correlation test and simple regression analysis were performed.

BVAS ANCA Cystatin C CRP U-MCP-1) U-IgM U-IL-8 U-IL-6 0.02 ns 0.2 ns 0.07 ns 0.2 ns 0.05 ns U-IL-8 0.05 ns 0 ns 0.2 ns 0.1 ns 0.3 0.1 ns U-IgM 0.07 ns 0.06 ns  ns 0.1 ns U-MCP-1 0.2 ns 0.06 ns    0.2 ns