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Table 5 Postoperative NRS of the two groups at 1 h after surgery prior the use of analgesic agents

From: Differences in heart rate variability may be related to the appearance of postoperative pain in patients undergoing breast cancer surgery

  Group A Group B p value
NRS at 1 h prior the use of analgesia 1.0 ± 0.9 4.0 ± 1.4* 0.005
  1. Group A (16 patients whose postoperative pain did not increase 12 h after the surgery)
  2. Group B (four patients whose postoperative pain increased 1 h after the surgery)
  3. Data are expressed as means ± SD
  4. NRS numerical rating scale
  5. *p < 0.05 compared with group A