A significant difference was found between the two groups (Pearson Chi-square test, p 0

001).<p><b>Copyright information:</b></p><p>Taken from "Evaluation of safe and effective administration of nitrous oxide after a postgraduate training course"</p><p>http://www.biomedcentral.com/1472-6904/8/3</p><p>BMC Clinical Pharmacology 2008;8():3-3.</p><p>Published online 11 Jun 2008</p><p>PMCID:PMC2438323.</p><p></p

** Significant difference between the 3 types of patients, Kruskal Wallis test: p 0

001.<p><b>Copyright information:</b></p><p>Taken from "Evaluation of safe and effective administration of nitrous oxide after a postgraduate training course"</p><p>http://www.biomedcentral.com/1472-6904/8/3</p><p>BMC Clinical Pharmacology 2008;8():3-3.</p><p>Published online 11 Jun 2008</p><p>PMCID:PMC2438323.</p><p></p