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Table 2 Demographic data of the two groups

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
Age (years) 59 ± 9 63 ± 16 0.64
Height (cm) 153 ± 5 157 ± 12 0.60
Weight (kg) 57 ± 17 56 ± 9 0.96
Anesthetic time (min) 110 ± 26 77 ± 12* 0.03
Operation time (min) 69 ± 26 46 ± 10 0.10
Remifentanil dosage during surgery (mg) 0.59 ± 0.22 0.48 ± 0.20 0.37
Sevoflurane dose during surgery (mL) 32 ± 9 25 ± 3 0.17
Fluid balance (mL) 742 ± 243 575 ± 202 0.23
Blood loss (mL) 41 ± 28 23 ± 8 0.28
  1. Demographic data of the two groups
  2. Group A (16 patients whose postoperative pain did not increase 12 h after the surgery)
  3. Group B (four patients whose postoperative pain increased 1 h after the surgery)
  4. Data are expressed as means ± SD
  5. *p < 0.05 compared with group A