Tamblyn 2018b.

Study characteristics
Methods	Cluster RCT
Participants	Urban primary care practices, Quebec, Canada 2331 patients, 76 primary care physicians
Interventions	Displayed out‐of‐pocket costs that patients would incur due to continuation of anti‐hypertensive medication and identified cost savings if switched to an alternative medication
Outcomes	Process adherence (prescribing)
Co‐Interventions	Educational: Multiple (>1) educational sessions for providers in intervention group Beyond Clinician Education: None
CDSS Features ‐ Acknowledgement of CDSS Required	Yes – required acknowledgement of the CDSS and documentation of action taken
CDSS Features ‐ Other	Conveyed patient‐specific information, decision support was complex, developed by study investigators, included supporting information on‐screen, interruptive, makes care recommendation, possible to execute desired action, 'push' mode of delivery, required provider input of clinical data, targeted underuse
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment (selection bias)	Low risk
Incomplete outcome data (attrition bias) All outcomes	Low risk
Baseline characteristics similar?	Low risk	N/A
Unit of analysis error	Low risk