DiMuzio 2017.

Methods	Study design: randomised controlled trial Study grouping: parallel Ethics and informed consent: not provided Follow‐up period: 30 days Sample size calculation: not stated ITT analysis: number randomised: 120 number analysed: 120 Funding: not stated Pre‐registration: not stated
Participants	Location: Philadelphia, USA Intervention group (high risk): n = 59control group (high risk): n = 60 (3 arms: low risk: n = 21) Mean age: not provided Inclusion criteria: femoral incisions closed primarily following elective vascular surgery Exclusion criteria: none stated
Interventions	Aim/s: to prospectively evaluate negative pressure therapy as a means to decrease wound complications and associated healthcare costs Group 1 (NPWT) intervention: NPWT Group 2 (control) intervention: standard gauze dressing Study date/s: not provided
Outcomes	infection LOS reoperation readmission Validity of measure/s: not provided Time points: over 30 days
Notes	Conference abstract
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Not reported
Allocation concealment (selection bias)	Unclear risk	Not reported
Blinding of participants and personnel (performance bias) All outcomes	Low risk	Evidence for participants: not possible Comment: unlikely to affect outcomes Evidence for personnel: not possible Comment: unlikely to affect outcomes
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Not reported
Incomplete outcome data (attrition bias) All outcomes	Low risk	140 (3 arms) were enrolled and analysed.
Selective reporting (reporting bias)	Low risk	Planned outcomes reported.
Other bias	Unclear risk	No other biases detected.