Methods	Cluster RCT, with the community hospitals the unit of randomisation
Participants	76 physicians (family physicians & obstetricians) from 16 community hospitals Intervention:n=8 and Control: n=8 Country: Canada Type of targeted behaviour: general management of a problem (obstetrical care)
Interventions	Intervention Local Opinion Leaders + distribution of educational materials. Audit & feedback + distribution of educational material Method of OL identification: Sociometric Proportion of social network that nominated OL: 65% Single OL or OL teams identified: single OL OL disseminated information: Informal & Formal. OL frequency of involvement: action taken at least at three distinct points in time + one: UNCLEAR Control Distribution of educational material
Outcomes	Health professional outcomes: mean percent of women offered a trial of labour. Patient outcomes: mean percent of women underwent a trial of labour and vaginal births
Notes
Risk of bias
Bias	Authors’ judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Pg.2202/Col 1/Para 1 “ we first randomly selected and assigned 16 eligible counties to one of the intervention or the control group. One eligible hospital was then randomly selected from each county to receive an invitation to participate in its assigned study group.”
Allocation concealment (selection bias)	Low risk	It was a cluster RCT, with the community hospitals the unit of randomisation
Blinding (performance bias and detection bias) All outcomes	Unclear risk	Not mentioned in the paper.
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Not mentioned in the paper.
Selective reporting (reporting bias)	Low risk	All outcomes mentioned in the methods section were also presented in the results
Other bias	Low risk
Similar baseline outcome measures?	Low risk	p.2205/Cil1/Para1, p.2205/Table 1 There were no significant differences for baseline characteristics
Similar baseline characteristics?	Low risk	p.2205/Cil1/Para1, p.2205/Table 1 There were no significant differences for baseline characteristics
Protection against contamination?	Low risk	p.2202/Col1/Para1 “,the unit of randomisation and intervention was the community hospital.”