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A box plot of the cumulative patient-controlled fentanyl consumptions for each group in the first 48 h postoperatively. Data are presented as the mean ± standard deviation. Group TR, TAP block with ropivacaine; group TRSF, TAP block with ropivacaine plus subcutaneous fentanyl; group TRF, TAP block with ropivacaine and fentanyl mixture. TAP, transversus abdominis plane. *P=0.002; #P=0.001 vs. group TR.
