. Tables [0](#SFV000TB0){ref-type="table"} and [0](#SFV000TB0){ref-type="table"} and Figure [0](#SFV000F0){ref-type="fig"} show the comparison of clinical and histological data, response to therapy and prognosis among ANCA-positive crescentic IgAN, ANCA-negative crescentic IgAN and ANCA--associated crescentic glomerulonephritis patients (simple random sampling). Table 0.Comparison among ANCA-positive crescentic IgAN, ANCA-negative crescentic IgAN and ANCA-associated crescentic glomerulonephritis patients (simple random sampling): baseline clinical data at renal biopsyANCA-positive crescentic IgANANCA-negative crescentic IgANANCA-associated crescentic glomerulonephritisP-valueNo. of patients00000