Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Need for additional medical attention for ongoing croup symptoms
Systematic review	100 children (4–10 years) presenting with mild croup not requiring hospital admission, and without stridor and chest wall indrawing at rest Data from 1 RCT	Proportion of children seeking additional medical attention for ongoing croup symptoms within 7–10 days 0/48 (0%) with oral dexamethasone (single dose) 8/48 (17%) with placebo	RR 0.06 95% CI 0.00 to 0.99 P value not reported	Effect size not calculated	oral dexamethasone
Systematic review	720 children with onset of mild croup in the previous 72 hours with Westley Croup Score (see table 1 ) at presentation of 2 or less Data from 1 RCT	Proportion of children seeking additional medical attention for ongoing croup symptoms within 7 days 26/352 (7%) with oral dexamethasone (single dose) 54/352 (15%) with placebo	RR 0.49 95% CI 0.31 to 0.77 P value not reported	Moderate effect size	oral dexamethasone