irmingham vasculitis activity score; NS, nephrotic syndrome; MABP, mean arterial blood pressure; SCr, serum creatinine; eGFR, estimated glomerular filtration rate calculated using the CKD-EPI two-level race equation; UTP, urinary total protein; Alb, serum albumin; HGB, haemoglobin; ESR, estimated sedimentation rate; CRP, C-reactive protein; ANA, antinuclear antibody.  [^00]: Normal distribution data were presented as average ± SD and non-normal distribution data as median (Q00, Q00).  [^00]: A P-value \<0.0000 in *post hoc* analysis among groups: ^a^ANCA-positive crescentic IgAN versus ANCA-negative crescentic IgAN; ^