Fig. 2.
(A) Boxplots of opioid use (in morphine equivalents) for the first postoperative day (POD) is shown. The gabapentin and placebo groups are shown on the x-axis. On the y-axis is shown the morphine equivalents (in milligrams). A typical box plot showed the median (thicker black line in the middle of the box) and first and third quartiles represented by the bottom and top of the box, respectively. The median (25th, 75th quartile) of morphine equivalents for the gabapentin-treated group 6.7 mg (1.3, 20.0 mg) versus the control group 6.7 mg (2.7, 24.8) differed on the first postoperative day (P = 0.04). The asterisk indicates significant difference between the gabapentin versus placebo groups based on Mann–Whitney U test. See text for details. (B) Boxplots of opioid use (in morphine equivalents) for the second postoperative day (POD). The median morphine equivalent dose in the gabapentin group was 1.0 (2.3 to 8.4 mg) versus 1.0 (2.7 to 6.0 mg) in the placebo group (P = 0.48). (C) Boxplots of opioid use (in morphine equivalents) for the third postoperative day (POD). The median morphine equivalent dose in the gabapentin group was 0.7 (1.7 to 4.0 mg) versus 0.7 (2.0 to 5.3 mg) in the placebo group (P = 0.72).