Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Intubation
Systematic review	30 children with moderate croup (excluding spasmodic croup) in an inpatient setting Data from 1 RCT	Proportion of children receiving intubation 3/16 (19%) with nebulised racemic adrenaline 0/14 (0%) with nebulised L-adrenaline	RD 0.19 95% CI –0.03 to +0.40		Not significant