Overhage 1997.

Study characteristics
Methods	Cluster RCT
Participants	General medical ward, academic medical center, Indianapolis, USA (Wishard Memorial Hospital) 2181 patients, 86 providers, 6 provider teams
Interventions	Guideline‐based reminders to consider implementing additional corollary orders as providers wrote orders for one of 87 selected tests or treatments. This CDSS intended to reduce errors of omission.
Outcomes	Process adherence (testing)
Co‐Interventions	Educational: None Beyond Clinician Education: Drug utilization review program for both control and interventions groups
CDSS Features ‐ Acknowledgement of CDSS Required	Yes ‐ required acknowledgement of the CDSS but not documentation of action taken
CDSS Features ‐ Other	Conveyed patient‐specific information, developed by study investigators, interruptive, makes care recommendation, possible to execute desired action, 'push' mode of delivery, targeted underuse, user workflow considered in design
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment (selection bias)	Unclear risk	N/A
Incomplete outcome data (attrition bias) All outcomes	Low risk
Baseline characteristics similar?	Low risk
Unit of analysis error	Low risk