Niezgoda 2004.

Study characteristics
Methods	2‐arm RCT Conducted in USA Follow‐up (at time results presented) 42 days (6 weeks)
Participants	97 participants. Inclusion criteria listed: stage III and IV pressure ulcers located on the trunk or trochanter regions Exclusion criteria listed: none listed
Interventions	Group A: NPWT (VAC) n = 54 Group B: moist wound healing (no further information) n = 43
Outcomes	Primary outcomes: none Secondary outcomes: Change in ulcer size (unadjusted) Cost
Notes	Conference abstract; interim analyses; abstract notes that full follow‐up was planned as 82 days Authors contacted via e‐mail and confirmed that the full study was not published and that outcome data were not available to us Funding not reported
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	No information
Allocation concealment (selection bias)	Unclear risk	No information
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	No information
Incomplete outcome data (attrition bias) All outcomes	High risk	Interim analysis in terms of both participant numbers and length of follow‐up for those participants recruited
Selective reporting (reporting bias)	Unclear risk	No information
Other bias	Unclear risk	No information; interim analysis ‐ not clear why further work not available