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Violin plots of the global QoR-40 at preoperative period and preoperative 24 h. The change in the QoR-40 score from the preoperative period to the postoperative 24 h in the 1-channel group was significantly decreased, but not in the 2-channel group (P < 0.001 and P = 0.819, respectively, by the Wilcoxon signed-rank test). Abbreviations: QoR-40, quality of recovery-40 questionnaire
