Gilvarry 1990.

Methods	Single‐centre parallel‐group randomized controlled trial conducted in the United Kingdom
Participants	60 adults undergoing upper gastrointestinal endoscopy (mean age: 41.4 in diazepam group and 42.2 in midazolam group; 46% men in diazepam group and 43% men in diazepam group)
Interventions	10 mg intravenous midazolam 20 mg intravenous diazepam
Outcomes	Measured 24 hours after the procedure: Participant satisfaction (measured in the trial as the participant considered sedation was inadequate) Anterograde amnesia (recalled procedures)
Notes	Conflicts of interest or funding sources were not reported
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	"Stratified randomised order"
Allocation concealment (selection bias)	Unclear risk	Not reported
Blinding of participants and personnel (performance bias) All outcomes	High risk	Not blinded
Blinding of outcome assessment (detection bias) All outcomes	Low risk	An author who did not know which medication had been administered assessed outcomes 24 hours after the procedure
Incomplete outcome data (attrition bias) All outcomes	Low risk	No withdrawals
Selective reporting (reporting bias)	Unclear risk	No clear evidence that measured outcomes were not reported (trial protocols were not sought for confirmation)
Other bias	Low risk	None expected