Study characteristics	Eligibility criteria (Insert eligibility criteria for each characteristic as defined in the Protocol)	Yes/No/Unclear	Details of outcomes & location in text
Type of study	Randomized controlled trial
	Controlled clinical trial (quasi‐randomized trial and cluster‐randomized)
	Cross‐over trial (both interventions in participants‐order randomized)
Participants	Adults > 16 years with BMI > 25 kg/m2 undergoing GA
Types of intervention and comparison	Comparison of either
	First‐generation SAD (e.g. cLMA)
	Second‐generation SAD (e.g. PLMA, SLMA)
	With
	Tracheal tube
	Failed intubation or change of airway device required
	Hypoxia between 1 minute before induction and full recovery
	Serious respiratory complications (including lower respiratory tract infection) within 30 days of anaesthetic
	Aspiration of gastric contents at any time between induction of anaesthetic and leaving recovery
Outcomes are not part of the eligibility criteria, so a study that meets design, participant and intervention criteria is included
INCLUDE     EXCLUDE   UNCLEAR
Reason for exclusion