Robling 2002.

Methods	Type of targeted behaviour: decrease in test ordering (lumbar and knee MRI) Study design: cluster RCT Country: UK
Participants	Setting: primary care 30 practices, 182 MRI requests Condition: people who potentially require MRI for knee or lumbar problems
Interventions	1. Professional intervention (distribution of educational materials + educational meetings, practice based) 2. Professional intervention (audit and feedback) 3. Professional intervention (1 + 2) 4. Control group: distribution of educational materials
Outcomes	Professional practice: proportion of MRI requests that are in concordance with guideline (length of follow‐up not clear) Patient level: none Cost: intervention cost
Notes	Justification for intervention type: not reported Intervention fidelity: not reported
Risk of bias
Bias	Authors' judgement	Support for judgement
Adequate sequence generation?	Low risk	From report: “Randomization...was performed using a random numbers table”
Allocation concealment?	Unclear risk	Not reported
Blinding? All outcomes	Unclear risk	Not reported
Incomplete outcome data addressed? All outcomes	Unclear risk	Not reported
Free of selective reporting?	Unclear risk	Insufficient information provided
Free of other bias?	Unclear risk	Not reported