Mainous 2000.

Methods	RCT unit of allocation: provider unit of analysis: episode of care power calculation: not done concealment of allocation: not clear follow up of professionals: done blinded assessment of outcome: done baseline measurement: not done reliable primary outcome measure: done protection against contamination: not clear analysis appropriate: no
Participants	269 family or general practitioners, pediatricians or general internists in Kentucky, USA treating children for upper respiratory tract infection
Interventions	1. Patient educational materials 2. Audit and feedback to physicians 3. Audit and feedback +patient educational materials 4. No intervention controls
Outcomes	Professional practice: change in rate of prescribing antibiotics for upper respiratory infection Patient: None
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	Unclear risk	B ‐ Unclear