Fig. 2From: Opioid-free anesthesia versus opioid-inclusive anesthesia for breast cancer surgery: a retrospective studyPostoperative NRS values for the OIA group and OFA group. The boundary of the box closest to 0 indicates the 25th percentile, the line within the box marks the median, and the boundary of the box furthest from 0 indicates the 75th percentile. Whiskers above and below the box indicate the 90th and 10th percentiles.Back to article page