CRP and anti-neutrophil cytoplasmic antibody-associated vasculitis: In the univariable Cox analysis using variables at AAV diagnosis, age (HR 1.062, p < 0.001), male sex (HR 2.633, p = 0.003), body mass index (HR 1.121, p = 0.011), BVAS (HR 1.082, p < 0.001), FFS (HR 1.960, p <0.001), ESR (HR 1.009, p = 0.036), CRP (HR 1.008, p = 0.001), white blood cell count (HR 1.000, p = 0.036), haemoglobin (HR 0.790, p = 0.002), blood urea nitrogen (HR 1.011, p = 0.004), serum creatinine (HR 1.143, p = 0.026), serum total protein (HR 0.562, p = 0.003), and serum albumin (HR 0.364, p < 0.001) were significantly associated with all-cause mortality.