Boyd 2002.

Methods	Type of targeted behaviour: increase in test ordering (BMD test) + prescribing Study design: cluster RCT Country: USA
Participants	Setting: primary care 149 providers, 258 patients Condition: osteoporosis detected by heel ultrasound
Interventions	1. Professional intervention (reminder: extended letter to physician about patient’s risk of osteoporosis) 2. Professional intervention (reminder: short letter about patient’s risk of osteoporosis)
Outcomes	Professional practice: number of patients contacted by physicians following distribution of reminders; number of patients having a BMD test within 6 months; prescription of osteoporosis medication 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?	Unclear risk	"randomly assigned" is only text used
Allocation concealment?	Unclear risk	Not reported
Blinding? All outcomes	Unclear risk	Not reported
Incomplete outcome data addressed? All outcomes	High risk	Outcomes for only 63% of patients followed up
Free of selective reporting?	Unclear risk	Insufficient information provided
Free of other bias?	Unclear risk	Potential unit of analysis error