Methods	Cluster RCT, with the ward as the unit of randomisation.
Participants	220 nurses from 6 medical 7AMP; surgical wards in a teaching hospital.Opinion leader + lecture: n=2; Opinion leader; n=2 and Lecture: n=2 Country: China (Hong Kong) Type of targeted behaviour: general management of a problem (proper use of urinary catheter)
Interventions	Intervention Local Opinion Leaders + standardised 30 minutes lectures Local Opinion Leaders Method of OL identification: Informant Proportion of Social Network that nominated OL: N/A Single OL or OL teams identified:teams consisting of a staff nurse + a nursing officer OL disseminated information: Formal (Small group demonstration tutorials) OL frequency of involvement:UNCLEAR Control Standardised 30 minutes lectures
Outcomes	Proportion of nurses’ actions meeting local guidelines for urinary catheter care
Notes
Risk of bias
Bias	Authors’ judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	p.210/Para3 “The three male medical and three female surgical wards in the hospital were divided by a random draw into three groups.”
Allocation concealment (selection bias)	Low risk	It was a cluster RCT, with the ward as the unit of allocation
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.213/Table 1
Similar baseline characteristics?	Low risk	p.213/Table 1
Protection against contamination?	Low risk	Randomisation was made at the level of the wards.