Fig. 2From: Pruritus after continuous administration of epidural morphine for post-cesarean delivery analgesia: a case control studya Overall association between morphine concentration and pruritus. b Moderation effects of pain level on the association between morphine concentration and pruritus. c Moderation effects of local anesthetics on the association between morphine concentration and pruritus. d Moderation effects of combined local anesthetics and pain level on the associations between morphine concentration and pruritus (based on Model 3)Back to article page