a ≥1 clinical relapses during follow-up.bChi square (categoric variables) or Student’s t
(continuous variables). NS: not significant. Anti-MPO:
anti-myeloperoxidase. Anti-PR3: anti-proteinase-3. MPA: microscopic
polyangiitis. GPA: granulomatosis with polyangiitis. EGPA: eosinophilic
granulomatosis with polyangiitis. ESRD: end-stage renal disease. IQR:
interquartile range. ENT: ear, nose, throat. CNS: central nervous
system.