Levy 2000.

Methods	STUDY DESIGN: Parallel group trial. LOCATION, NUMBER OF CENTRES: UK, two outer‐London general hospitals. DURATION OF STUDY: 6 months. COMPLIANCE: 57% participants had three education sessions (either in person or by telephone); 63% had two sessions and 77% had one session. CONFOUNDERS: Comparable groups at baseline. "
Participants	N SCREENED: 865 N RANDOMISED: 211 N COMPLETED: 181 M = 80 F = 131 MEAN AGE: 42 BASELINE DETAILS: PEF 47% predicted (in ED). INCLUSION CRITERIA: Presentation at ED with acute asthma. EXCLUSION: Not reported.
Interventions	Education group: 1 hr consultation with specialist nurse two weeks post‐study entry, followed by an additional two consultations of 30 minutes at 6 weekly intervals. Asthma control was assessed, followed by some education on recognising and treating acute asthma. Control group: Usual care. FOLLOW‐UP PERIOD: 6 months.
Outcomes	Peak flow; quality of life (as measured by the St George Respiratory Questionnaire); symptom scores; asthma attacks.
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Computer generated equal blocks of 4 from randomly generated number sequence.
Allocation concealment (selection bias)	Low risk	'The nurses had no idea which group the patients would be randomised into, however, once randomised they became aware in order to proceed and invite intervention group patients to attend.'
Blinding (performance bias and detection bias) All outcomes	Unclear risk	Participants aware as to treatment group assignment. 'An interviewer, blinded to the patients randomisation status, conducted four structured telephone interviews using the St George's Respiratory Questionnaire and an assessment questionnaire...'
Incomplete outcome data (attrition bias) All outcomes	Low risk	All participants accounted for.
Selective reporting (reporting bias)	Unclear risk	Cannot ascertain this reliably.
Other bias	Low risk	No other sources of bias could be identified.