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| Primary outcome 1: | Westley Croup Score (a validated measure of croup severity, based on clinical observations of stridor, retractions, air entry, cyanosis, and level of consciousness) |
| Timepoint: | 0, 1, 2, 3, 4, 5, 6, 12 hours after the treatment is administered |
| Primary outcome 2: | Unscheduled medical re-attendance rate, as assessed by follow-up telephone call |
| Timepoint: | During the 7 days post-treatment |
| Secondary outcome 1: | Incidence of Vomiting |
| Timepoint: | During 30 minute interval following dose |
| Secondary outcome 2: | Duration of stay in the Emergency Department |
| Timepoint: | From time of triage to discharge-ready time and actual discharge time |
| Secondary outcome 3: | Duration of hospital admission or observation |
| Timepoint: | From time of triage to discharge-ready time and actual discharge time |
| Secondary outcome 4: | Admission rate to Emergency Department Observation ward |
| Timepoint: | During initial enrolment visit |
| Secondary outcome 5: | Admission rate to hospital ward |
| Timepoint: | During initial enrolment visit |
| Secondary outcome 6: | Need for nebulised adrenaline (epinephrine), as recorded by treating staff, ie whether or not nebulised adrenaline was administered (decision at the discretion of treating doctor). |
| Timepoint: | Prior to oral steroid dose, after oral steroid dose (during initial enrolment visit) |
| Secondary outcome 7: | Admission rate to Intensive Care Unit |
| Timepoint: | During initial enrolment visit |
| Secondary outcome 8: | Need for definitive airway (tracheal intubation or surgical airway), as recorded by treating staff, ie whether or not a definitive airway was placed (decision at the discretion of treating doctor). |
| Timepoint: | During initial enrolment visit |
| Secondary outcome 9: | Number of additional doses of steroid given after trial drug |
| Timepoint: | During the 7 days post-treatment (including the period of initial enrolment visit) |
| Secondary outcome 10: | Unscheduled Hospital re-attendance rate |
| Timepoint: | During the 7 days post-treatment |
| Secondary outcome 11: | Hospital re-admission rate for croup symptoms (stridor or breathing difficulty), as assessed by follow-up telephone call |
| Timepoint: | During the 7 days post-treatment |
| Secondary outcome 12: | Hospital re-admission rate for non-croup symptoms |
| Timepoint: | During the 7 days post-treatment |
| Secondary outcome 13: | Adverse clinical events, other than vomiting (for example skin rash, changes in behaviour or appetite), as reported by treating staff and as reported by caregivers at follow-up telephone call |
| Timepoint: | During initial enrolment visit, during 7 days post-treatment |
