Castro 2003.

Methods	Randomised trial
Participants	96 participants, all admitted with the primary admitting diagnosis of asthma between September 1996 and July 1999
Interventions	Intervention: provision of an asthma nurse specialist to provide a multifaceted approach to asthma care for 'high‐risk' inpatients. Control: usual care provided by private primary care physician
Outcomes	Hospital patient readmissions Costs Quality of life
Country/Setting	USA: Barnes‐Jewish Hospital, Washington
Notes	No funding source reported. Declared no conflict of interest
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Patients randomly assigned to intervention or usual care group using a prerandomised assignment.
Allocation concealment (selection bias)	Low risk	Blind concealment sequence allocation using a prerandomised assignment in a sealed envelope.
Blinding of participants and personnel (performance bias) All outcomes	High risk	The patients and healthcare team were not blinded to treatment assignment due to the nature of the intervention.
Blinding of outcome assessment (detection bias) All outcomes	High risk	Quote: "Three consecutive nurses provided the intervention and collected the data for the study."
Incomplete outcome data (attrition bias) All outcomes	Low risk	Primary outcomes reported.
Selective reporting (reporting bias)	Low risk	All primary outcome data reported.
Baseline characteristics similar for intervention group and control?	Low risk	Baseline characteristics of both groups reported comprehensively.
Other bias	Low risk	No other bias evident within paper.