O'Connell 1999.

Methods	RCT unit of allocation: postal code regions unit of analysis: episodes of care power calculation: done concealment of allocation: not clear follow up of professionals: not clear blinded assessment of primary outcome: done baseline measurement: done reliable primary outcome measure: done protection against contamination: done analysis appropriate: no
Participants	2440 general practitioners grouped by postal code region in rural Australia treating patients of all ages with any community acquired infection
Interventions	1. Printed educational materials + audit and feedback 2. No intervention control
Outcomes	Professional practice: Change in rate of prescribing antibiotics Patient: None
Notes	Specific prescribing guidelines and recommendations not made
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	Unclear risk	B ‐ Unclear