Fig. 2

Comparison of NRS scores of the three groups at different time points after the operation. Figure Repeated-measures ANOVA was used to compare the differences in NRS scores among the three groups at different time points. ^#P: Compared with the control group (Group C), the NRS scores of Group N1 (2 µg/kg) were significantly lower at 12 and 48 h postoperatively (P < 0.05). ^*P: Compared with the 12 h postoperative time point, the NRS scores at 24 h were lower in Group N1 and Group C (P < 0.05). ^***P: Compared with the 12 h postoperative time point, the NRS scores were significantly lower at 24 h in Group N2 and at 48 h in all three groups (P < 0.001)