Riley 2011.

Methods	Cluster‐randomised trial
Participants	Who: All labour and delivery staff Number: Not reported Proportion of eligible staff participating: Not reported
Interventions	Intervention description: Didactic training in TeamSTEPPS or TeamSTEPPS and in situ simulation training Control: No intervention Location: Webinars and in situ simulation Delivered by: Not clear Length: 2 1/2 hours Duration: 11 simulations
Outcomes	Outcomes: Weighted adverse outcome score, staff attitude Follow‐up: 1 year
Population studied	Description: All women admitted to the hospitals between 2005 and 2008 Number: Not clear
Funding Source	US Agency for Healthcare Research and Quality and University of Minnesota Academic Health Center
Study Setting	3 small community hospitals in the USA with a combined total of 1800 deliveries per year
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Not documented
Allocation concealment (selection bias)	Unclear risk	Not documented
Blinding of participants and personnel (performance bias) All outcomes	High risk	Not documented, but not possible to blind participants to intervention
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Not documented
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	No discussion of incomplete data
Selective reporting (reporting bias)	Low risk	Outcomes discussed in methods were reported.
Other bias	High risk	Differences between sites, including better staffing at 1 of the intervention hospitals