Tamblyn 2003.

Study characteristics
Methods	Cluster RCT
Participants	Primary care practices, Quebec, Canada 12 560 encounters, 107 providers
Interventions	CDSS identifying clinically relevant prescribing problems in the elderly (drug‐disease contraindications, drug interactions, drug‐age contraindications, duration of therapy, and therapeutic duplication)
Outcomes	Process adherence (prescribing)
Co‐Interventions	Educational: None Beyond Clinician Education: None
CDSS Features ‐ Acknowledgement of CDSS Required	Not reported
CDSS Features ‐ Other	Ambush, conveyed patient‐specific information, included supporting information on‐screen, makes care recommendation, 'push' mode of delivery, targeted overuse
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment (selection bias)	Low risk	N/A
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	N/A
Baseline characteristics similar?	Low risk
Unit of analysis error	Low risk