passages.id: split_4_validation_779_passage
passages.type: progene_text
passages.text: Univariate analysis showed class IV nephritis , hypertension , impaired renal function ( glomerular filtration rate < 50 mL / min ) , nephrotic syndrome at time of renal biopsy , and failure of complete remission in the first year of treatment were unfavorable predictors for renal survival .