Study	Reason for exclusion
Afilalo 1999	RCT of inhaled corticosteroids vs standard care in ED.
Arnaud 1982	RCT of in‐patients receiving corticosteroids.
Barnett 1997	IV vs oral corticosteroid in ED prevention of admission. No placebo arm.
Deshpande 1986	Home‐based, out‐patient treatment with corticosteroids (correspondence with authors).
Fanta 1983	In‐patient treatment protocol.
Guttman 1997	RCT of inhaled corticosteroids vs standard care in ED. No placebo arm
Klig 1997	IV vs oral corticosteroids for out‐patient care. No placebo arm
Morray 1995	Not an RCT.
Ogirala 1991	Patients were experiencing chronic asthma, as opposed to an acute exacerbation.
Pansegrouw 1992	RCT of inhaled corticosteroids vs standard care in ED. No placebo arm
Rodrigo 1998	RCT of inhaled corticosteroids vs standard care in ED. No placebo arm
Scarfone 1995	RCT comparing two different delivery systems (oral vs nebulization), doses, and therapeutic agents (prednisone vs dexamethasone) for the treatment of acute asthma. Admission rates were reported, but no placebo arm was documented.
Schuckerman 1998	IV vs oral RCT in out‐patient setting. No placebo arm
Shapiro 1983	RCT of oral steroids as out‐patients after discharge from the acute care setting.
Sung 1997	RCT of inhaled corticosteroids vs standard care in ED.
Volovitz 1998	RCT of inhaled corticosteroids vs standard care in ED.