Kerry 2000.

Methods	Type of targeted behaviour: decrease in test ordering (x‐rays, various) Study design: cluster RCT Country: UK
Participants	Setting: primary care 69 practices, 175 providers, 43,778 radiological requests Condition: people potentially requiring an x‐ray of chest, spine or limbs and joints
Interventions	1. Professional intervention (distribution of educational materials + audit and feedback) 2. No intervention control group
Outcomes	Professional practice: number of x‐rays requested (chest, limbs & joints, spine) within 12 months Patient level: none
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: “Practices were randomly allocated to an intervention or a control group using a stratified randomization”
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?	Low risk