age, MAP, eGFR, 24h proteinuria, serum C3 level(binary variable, low C3 or not), serum C4 level (binary variable, low C4 or not), treatment (ACEI/ARB, steroid and/or immunosupressor) and pathological parameters based on Oxford IgAN classification including endocapillary hypercellularity, mesangial hypercellularity, interstitial fibrosis/ tubular atrophy, segmental glomerulosclerosis, crescents. 