Methods	Re-analysed as an ITS design. One site, no control Intervention implemented from July 2000
Participants	Four administratively linked hospitals in Dallas, Texas
Interventions	Web-based “patient occurrence system” not limited to medical error
Outcomes	Incident reporting rate
Notes
Risk of bias
Bias	Authors’ judgement	Support for judgement
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Not specified in the paper
Selective reporting (reporting bias)	Low risk	All relevant outcome reported
Other bias	Low risk	No evidence of other risk of bias
Other changes	Unclear risk	Not specified in the paper
Shape of the intervention	Unclear risk	It is not clear what is the point of analysis
Data collection	Low risk	The intervention itself included a change in the data collection method
Allocated intervention	Low risk	Objective outcome measure