The univariate analysis showed significant differences in sex, fever, history of urological surgery, WBCC, neutrophils, serum CRP, serum albumin, urine leukocyte, WBCC, grade of hydronephrosis, CT value of hydronephrosis, and thick wall of the renal pelvis (P < .05) between 2 groups. Here, ALB is linked to hydronephrosis.