Figure 1: Distribution of postoperative pain scores of groups versus time, * 30.th minute Group L difference, p<0.0001. †1,2,3.th hours Group L difference, p=0.005, p>0.0001, p=0.008. Group L: only 0.25% levobupivacaine 0.5 mg/kg via caudal route, Group LM: 0.25% levobupivacaine 0.5 mL/kg plus morphine 50 μg/kg via caudal route.