AUC score Bolus consumption Satisfaction Control 112,0 (5,4) 4,3 (0,8) 6,3 (1,2) IBPB 51,9* (2,8) 2,6* (1,5) 8,0* (1,2) Local 59,6* (3,4) 3,5* (1,5) 7,8* (0,9)

Table 2: Area under the curve (AUC) of the VAS score trends, mean of bolus consumption and patient satisfaction score at 24 hours postoperatively for the three groups. Standard deviation in brackets. *P<0.05 versus control group.