ALB and Hypertension: Based on the LASSO regression analysis results, 15 features were chosen to be potential predictors of PI, including sex, age, hypertension, DM, malignant tumour, CTX total dose, use of biologics, use of MMF, use of CNIs, use of methylprednisolone at 500 mg, use of methylprednisolone at 40 mg, total cumulative dose of methylprednisolone at 40 mg, use of oral glucocorticoids, albumin level, and haemoglobin level.