Fig. 1From: Incidence of tolerance in children undergoing repeated administration of propofol for proton radiation therapy: a retrospective studyMean doses of propofol (upper plane) and mean awakening time (lower plane) in children with tolerance to propofol (n = 15) and in children without tolerance to propofol (n = 43) during the course of proton radiation therapy. Symbols represent the mean and error bars represent standard deviationsBack to article page