Domes 2011.

Study characteristics
Methods	RCT
Participants	65 men having surgery on male genitalia. Country in which study was conducted and dates of the study are not given.
Interventions	Group 1: preoperative hair removal with a razor (n = 28) Group 2: preoperative hair removal with clippers (n = 37) Product details: no details are given on the razor or the clippers. Timing of hair removal: not reported. Hair removed by: not reported. Venue for hair removal: not reported.
Outcomes	Primary outcome: skin trauma and shave quality. Photographs taken immediately after hair removal and assessed in a blinded fashion by 5 surgeons and 15 nurses. Secondary outcome: surgical site infection. Definition not given. Assessed at 3 months, no details regarding who conducted assessment.
Notes	Abstract from poster presentation. No funding sources mentioned. No details of conflict of interest.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Quote "Patients were randomised" Comment: no description provided of generation of randomisation sequence.
Allocation concealment (selection bias)	Unclear risk	Not reported. Comment: not clear whether the person responsible for allocation to groups would have been able to predict to which group a potential participant would be allocated.
Blinding (performance bias and detection bias) Care providers blinded	Unclear risk	Not reported. Comment: unclear whether care providers were blinded to intervention allocation.
Blinding (performance bias and detection bias) Participants blinded	High risk	Not reported. Comment: participants would have been aware of hair removal method.
Blinding of outcome assessment (detection bias) All outcomes	Low risk	Assessors were blinded. Comment: blinded assessment undertaken .
Incomplete outcome data (attrition bias) ITT analysis undertaken	Unclear risk	Not reported. Comment: no information provided regarding whether participants were analysed in the groups to which they had been allocated.
Incomplete outcome data (attrition bias) Drop out rate acceptable	High risk	Dropouts for SSI were not reported, but group sizes appeared unequal. Comment: participants were not evenly distributed across groups.
Selective reporting (reporting bias)	Low risk	Main outcomes reported. Comment: unlikely to be affected by reporting bias.
Other bias	Unclear risk	Comment: no information on the similarity of groups.