Participants with ratios of more than 1 had higher erythrocyte sedimentation rate (ESR) and C-reactive protein (CRP) serum levels compared with those with a ratio of less than or equal to 1 (Figure 6D), but disease activity assessed by Birmingham Vasculitis Activity Score for Wegener’s Granulomatosis (BVAS/WG) did not show any association with this ratio (Figure 6E). Here, CRP is linked to granulomatosis with polyangiitis.