Fig. 1From: Postoperative analgesia for upper gastrointestinal surgery: a retrospective cohort analysisFrequency of recorded a rest and b dynamic pain scores. Frequency of recorded pain scores over different postoperative days (0 to 3) across three analgesic techniques. The X axis denotes the numerical rating scale (0–10), Y axis denotes proportion of patients in that group. The red bars represent the pain score with the most countsBack to article page