Veninga 2000.

Methods	RCT unit of allocation: physician group unit of analysis: physician group 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: yes
Participants	181 general practitioners from 24 pharmacotherapy counselling groups in the Netherlands treating adult patients for asthma and urinary tract infection (women only)
Interventions	1. Educational meetings + audit and feedback + printed educational materials for asthma management 2. Same intervention for the management of urinary tract infection
Outcomes	Professional practice: Change in rate of prescribing antibiotics for asthma Changes in rate of prescribing first‐choice antibiotics and average duration of treatment for urinary tract infection:
Notes	Prescribing messages based on Dutch GP guidelines
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	Unclear risk	B ‐ Unclear