ALB and Atrophy: The results of the LASSO regression revealed the following nine variables as risk factors affecting the development of renal anaemia in patients with IgA nephropathy: age, sex, diastolic blood pressure (DBP), serum albumin (ALB), cholesterol (CHOL), triglyceride (TG), CKD stage, mesangial hypercellularity (M), and tubular atrophy/interstitial fibrosis (T).