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VNRSr (A) and VNRSc (B) change according to the time. Control group received ultrasound transversus abdominis plane block with 20 mL of 0.9% normal saline. TAP block received ultrasound transversus abdominis plane block with 20 mL of 0.5% levobupivacaine. VNRSr, verbal numerical rating scale at resting state; VNRSc, verbal numerical rating scale at coughing; TAP, transversus abdominis plane. *P < 0.05 compared with the control group.
