Baum 1997.

Methods	Randomization and treatment allocation method: yes Blinding of outcome assessment: yes Blinding of participants: no Study period: not stated
Participants	Number: 46 enrolled Inclusion criteria: un‐pre‐medicated paediatric patients (6 months to 8 years) scheduled for elective ambulatory surgery under general anaesthesia who had ASA physical status I to II, no known reactive airway, no history of malignant hyperthermia Exclusion criteria: not stated
Interventions	All groups received 70% N2O with total flow 6 LPM, tidal volume breathing technique and paediatric circle circuit Group 1: 8% sevoflurane with priming technique Group 2: incremental sevoflurane Group 3: incremental halothane
Outcomes	Time to complete calmness Time to eye closure Child’s distress (modified Observation Scale of Behavioral Distress) Complication
Notes	Location: USA Setting: operating room Source of funding: Abbott Laboratories
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Quote: "Patients had anaesthesia induced by one of three methods, as assigned by means of a table of random numbers"
Allocation concealment (selection bias)	Unclear risk	Insufficient information to permit judgement
Blinding (performance bias and detection bias) All outcomes	Low risk	Quote: "Video recordings were analysed off‐line by a different paediatric anaesthesiologist"
Incomplete outcome data (attrition bias) All outcomes	Low risk	No missing data
Selective reporting (reporting bias)	Low risk	Study authors reported all planned outcomes