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. 2009 Oct 7;2009(4):CD002192. doi: 10.1002/14651858.CD002192.pub2

Raybould 1987.

Methods Anaesthetic drugs used: thiopentone, N2O, O2 and halothane. Fentanyl 1microg/kg 
 Premed‐induction interval: 60 
 (minutes)
Participants 53
Interventions Drug(s) and dose: midazolam 15mg vs. midazolam 7.5mg vs. placebo
Outcomes DSST 30, 60 and 120 minutes after emergence
Notes 1) Linear analogue scale used for patients' sedation and anxiety 
 Midazolam 15mg gave significant reduction in anxiety and increase in sedation. 
 2) Difference from placebo? Midazolam 15mg at each test
Risk of bias
Bias Authors' judgement Support for judgement
Adequate sequence generation? Unclear risk Method of randomization unknown
Allocation concealment? Unclear risk Unclear