Hart 2002.

Methods	Design: parallel‐group randomised controlled trial; blinding not stated Duration: 13 weeks Setting: not reported. UK Trial registration: not reported
Participants	Population: 83 'pre‐school' children with asthma randomised to an asthma education intervention or usual care (n for each group not given) Age: 'pre‐school children'; no further details reported Baseline asthma severity: not reported Inclusion criteria: 'asthmatic pre‐school children'; no further details reported Exclusion criteria: not reported Percentage withdrawn: not reported Other allowed medication: not reported
Interventions	Intervention summary: educational booklet about asthma and its treatment, and clinic consultation based on contents of booklet Control summary: usual care Complex intervention: yes
Outcomes	Outcomes measured: adherence; beliefs and anxieties about adherence Adherence calculation: medication electronically monitored; details of adherence calculation not given
Notes	Type of publication: conference abstract Funding: National Asthma Campaign, UK
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Children were "randomly allocated" ‐ no further details
Allocation concealment (selection bias)	Unclear risk	No details
Blinding of participants and personnel (performance bias) All outcomes	High risk	No description of procedures to blind participants or personnel
Blinding of outcome assessment (detection bias) All outcomes	High risk	No description of procedures to blind outcome assessors
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Drop‐out not reported, so unclear how many participants completed the study
Selective reporting (reporting bias)	High risk	Conference abstract, so minimal details given. No prospective trial registration identified
Other bias	Low risk	None noted