Abbreviations: GPA – granulomatosis with polyangiitis, MPA – microscopic polyangiitis, PR3 – proteinase 3, MPO – myeloperoxidase, ESR – erythrocyte sedimentation, rate. *Median dose of prednisone was 12 (13; 22) mg. **Immunosuppressive medications included azathioprine (8), methotrexate (2) and mycophenolate mofetil (2).