Table 1.

PICO employed in this systematic review.

P	Patient, Population, or Problem	How would I describe a group of patients similar to mine? Children with croup < 12 years of age.
I	Intervention, Prognostic Factor, or Exposure	Which main intervention, prognostic factor, or exposure am I considering? Prednisolone or dexamethasone
C	Comparison or Intervention (if appropriate)	What is the main alternative to compare with the intervention? Studies that examine prednisolone usage or compare prednisolone with dexamethasone
O	Outcome you would like to measure or achieve	What can I hope to accomplish, measure, improve, or affect? Measured symptom reduction, dosages and re-presentation rates.