Jackson 2005.

Methods	Type of targeted behaviour: decrease in test ordering (lumbar x‐rays) + referral + prescribing Study design: ITS Country: USA
Participants	Setting: primary care Over 10 million patient encounters; number of physicians not reported Condition: acute LBP
Interventions	Professional intervention (distribution of educational materials)
Outcomes	Professional practice: number of radiographs ordered for LBP; medication recommended (acetaminophen, NSAIDs, muscle relaxant, narcotic); physiotherapy referral Patient level: none
Notes	Justification for intervention type: not applicable because measuring impact of release of guidelines Intervention fidelity: not reported