IL6 and diabetes mellitus: There were not significant differences in factors such as gender (p = 0.962), age (p = 0.426), diabetes (p = 0.079), hypertension (p = 0.502), hydronephrosis (p = 0.365), stone burden (p = 0.566), pyuria (p = 0.670), urine culture (p = 0.793), operative time (p = 0.201), preoperative serum levels of IL-6 (p = 0.111) and PCT (p = 0.717).