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Table 5 The total number of patients with pain breakthrough episodes during the study period and during day 4, i.e. the day of CEA removal, and the number of patients receiving extra doses of opiates during day 4.

From: Pharmacological strategies to reduce pruritus during postoperative epidural analgesia after lumbar fusion surgery - a prospective randomized trial in 150 patients

  Group B Group R P value
Patients with pain breakthrough episodes total/n 40/66 43/69 0.49
Patients with pain breakthrough episodes day 4/n 25/66 17/68 0.08
Patients receiving extra doses of opiates day 4/n 54/66 55/68 0.89