McNulty 2000.

Methods	CBA unit of allocation: community unit of analysis: episodes of care power calculation: not done baseline measurement: not done characteristics for studies using second site as control: done blinded assessment of primary outcome: done protection against contamination: done reliable primary outcome measure: done follow up of professionals: not clear
Participants	339 general practitioners from 84 practices in Great Britain treating patient of all ages for any community acquired infection
Interventions	1. Educational meetings (small group)+ printed educational materials + audit and feedback 2. Educational meetings (microbiology tutorial)
Outcomes	Professional practice: Change in number of antibiotics prescribed per 1000 prescribing units Change in cost of antibiotics prescribed per 1000 prescribing units Patient: None
Notes	Gloucestershire antibiotic prescribing guidelines created and reviewed annually by local pharmacy advisors, specialist consultatns and GPs and are approved by the local Drug and Therapeutics Committees and Local Medical Committees. They are based upon local antimicrobial sensitivity patterns and trials on antibiotic use in general practice.
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	Unclear risk	D ‐ Not used