Gonzales 1999.

Methods	CBA unit of allocation: practice unit of analysis: practice power calculation: not done baseline measurement: done characteristics for studies using second site as control: not done blinded assessment of primary outcome: done protection against contamination: done reliable primary outcome measure: done follow up of professionals: done analysis appropriate: yes
Participants	93 general practitioners and internists in 4 practices in Colorado, USA treating adult patients with acute bronchitis
Interventions	1. Educational meetings + including audit and feedback + patient educational materials 2. Patient educational materials + including audit and feedback 3. No intervention control
Outcomes	Professional practice: Change in rate of prescribing of oral antibiotics for acute bronchitis Patient: None
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	Unclear risk	D ‐ Not used