ALB and diabetes mellitus: There were no significant differences between the two groups in the following factors: body mass index (p = 0.240), diabetes (p = 0.091), hypertension (p = 0.645), body temperature (p = 0.125), number of stones (p = 0.205), hydronephrosis (p = 0.556), preoperative blood neutrophils (p = 0.549), preoperative blood lymphocytes (p = 0.559), preoperative blood neutrophile-lymphocyte ratio (NLR) (p = 0.922), elevated CRP (p = 0.059), albumin-globulin ratio <1.5 (p = 0.725), serum creatinine (p = 0.190), and operation time (p = 0.877) (Table 1).