Fig. 1. ( A ) Pain intensity scores at rest (verbal rating scale: 0 = none, 4 = unbearable) before (pre) and after abdominal hysterectomy in 50 patients who received morphine or tramadol infusions for 48 h. Box whisker plots are shown (median = point; box = interquartile range; whiskers = range), with no significant differences. ( B ) Pain intensity scores during movement (verbal rating scale: 0 = none, 4 = unbearable) before (pre) and after abdominal hysterectomy in 50 patients who received morphine or tramadol infusions for 48 h. Box whisker plots are shown (median = point; box = interquartile range; whiskers = range), with no significant differences.