Study	Reason for exclusion
Britton 1976	Not randomised.
Chapela 1995	Equivalent doses of prednisolone and deflazacort
Emerman 1995	Pulmonary function measured at 3 and 5 hours only.
Fanta 1983	Randomised control trial of hydrocortisone (single dosage arm) versus placebo in acute asthma.
Hall 1995	Equivalent doses of hydrocortisone and methylprednislone
Loren 1980	Randomised control trial placebo versus prednisolone treatment, participant ages 7 to 17.
McFadden 1976	Data collected for the first 6 hours of treatment only.
Prazakova 1988	Not randomised
Raimondi 1986	Not randomised
Sue 1986	Equivalent doses of hydrocortisone, dexamethasone and methylprednisolone.
Webb 1986	Patients not requiring admission to hospital.