1. Efficacy of Peripheral Morphine Analgesia in Inflamed, Non-Inflamed and Perineural Tissue of Dental Surgery Patients 
Rudolf Likar, MD, Wolfgang Koppert, MD, Hubert Blatnig, MD, Friedrich Chiari, MD, Reinhard Sittl, MD, Christoph Stein, MD, Michael Schäfer, MD 
Journal of Pain and Symptom Management 
Volume 21, Issue 4, Pages (April 2001)
DOI: /S (01)

2. Fig. 1
Columns represent differences (mean ± SEM) in VAS scores (ΔVAS) of patients receiving saline versus patients receiving morphine(VASsal − VASmor) in trial 1 (A), trial 2 (B), and trial 3 (C). In patients with inflammatory tooth pain (A), differences in VAS scores between the saline and morphine group are significantly different (P < 0.05, RM-ANOVA). In patients without inflammatory tooth pain (B) or with perineural morphine administration (C) differences in VAS scores are not significantly different
Journal of Pain and Symptom Management  , DOI: ( /S (01) )