 The endotracheal tube ETT size was selected by using the formula age4 4.5. Only a single laryngoscopy attempt was allowed. Small, brief movements of extremities occurring after ETT placement did not considered as exclusion criteria. Anesthesia was delivered by anesthetic machine Datex Ohmeda, using an Ayers T-piece with Jackson Rees modification system, with a fresh gas flow of 6 Lmin through a Sevoflurane vaporizer. 