Fig. 1From: Wound infiltration with ropivacaine as an adjuvant to patient controlled analgesia for transforaminal lumbar interbody fusion: a retrospective studyBoxplot showing sufentanil consumption in the postoperative period for two groups. The boxes indicate the interquartile range, the crosses within the boxes indicate the median, and the whiskers indicate the range. The asterisks indicate significance(P < 0.05). h = hours postoperativelyBack to article page