Mazzone 1993.

Methods	Two‐arm RCT (not clear if single or multi‐centred) comparing a foam dressing (PolyMem, Ferris) with wet‐to‐dry saline gauze dressing undertaken in the USA.      Duration of follow‐up: 8 weeks.
Participants	19 participants Inclusion criteria: Diabetic foot ulcer.  Exclusion criteria: Not reported.
Interventions	Group A (n = 11): Foam membrane dressing (PolyMem, Ferris). No other details. Group B (n = 8): Wet‐to‐dry saline gauze dressings. No other details. Co‐interventions: None reported.
Outcomes	Primary outcome: Ulcer healing (number of ulcers healed; % reduction in wound size). Secondary outcomes: Not reported.
Notes	Trial data: Analysis 4.1 Conference abstract. Funding source: Ferris manufacturing corporation (Burr Ridge,IL).
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Quote:"..were randomly assigned…" Comment: Method of generation of random schedule not reported.
Allocation concealment (selection bias)	Unclear risk	Comment: The process of randomising participants, including who did this is not reported.
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	Comment: No mention of blinding in study report.
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Comment: No mention of blinding in study report.
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Comment: Not clear (conference abstract).
Selective reporting (reporting bias)	Unclear risk	Comment: Based on conference abstract, protocol not obtained.
Other bias	Unclear risk	Comment: Funded by commercial organisation.