Study	Reason for exclusion
Agas 2006	Study did not randomise participants.
Ahroni 1993	The dressing groups evaluated in this study were not foam dressings.
Altman 1993	No single, identifiable dressing type evaluated.
Alvarez 2003	The dressing groups evaluated in this study were not foam dressings.
Apelqvist 1990	The dressing groups evaluated in this study were not foam dressings.
Apelqvist 1996	No single, identifiable dressing type evaluated.
Apelqvist 2004	No single, identifiable dressing type evaluated.
Armstrong 2004	No single, identifiable dressing type evaluated.
Belcaro 2010	The dressing groups evaluated in this study were not foam dressings.
Bogaert 2004	Study did not randomise participants.
Bradshaw 1989	Trial stopped after recruiting six participants. No data presented. Authors not contacted for healing data.
Caravaggi 2003	Other intervention, not dressings, differ between trial arms.
Chang 2000	Study did not include diabetic foot ulcers.
Chauhan 2003	Other intervention, not dressings, differ between trial arms.
Chirwa 2010	Study did not randomise participants.
Cuevas 2007	No single, identifiable dressing type evaluated.
D'Hemecourt 1998	The dressing groups evaluated in this study were not foam dressings.
Dash 2009	Other intervention, not dressings, differ between trial arms
Diehm 2005	Study did not randomise participants
Donaghue 1998	The dressing groups evaluated in this study were not foam dressings
Driver 2006	Other intervention, not dressings, differ between trial arms
Edmonds 2009	Other intervention, not dressings, differ between trial arms
Eginton 2003	No single, identifiable dressing type evaluated.
Etoz 2004	Study did not randomise participants.
Farac 1999	Author contacted: study not suitable for inclusion due to data quality issues.
Foo 2004	The dressing groups evaluated in this study were not foam dressings.
Foster 1999	Other intervention, not dressings, differ between trial arms.
Gao 2007	Other intervention, not dressings, differ between trial arms.
Gentzkow 1996	Other intervention, not dressings, differ between trial arms.
Gottrup 2011	The dressing groups evaluated in this study were not foam dressings.
Hanft 2002	Other intervention, not dressings, differ between trial arms.
Jeffcoate 2009	The dressing groups evaluated in this study were not foam dressings.
Jeffery 2008	Study did not randomise participants.
Jensen 1998	The dressing groups evaluated in this study were not foam dressings.
Jude 2007	The dressing groups evaluated in this study were not foam dressings.
Kordestani 2008	The dressing groups evaluated in this study were not foam dressings.
Lalau 2002	The dressing groups evaluated in this study were not foam dressings.
Landsman 2010	Other intervention, not dressings, differ between trial arms.
Lazaro‐Martinez 2007	Other intervention, not dressings, differ between trial arms.
Lipkin 2003	Other intervention, not dressings, differ between trial arms.
Markevich 2000	The dressing groups evaluated in this study were not foam dressings.
Marston 2001	Other intervention, not dressings, differ between trial arms.
McCallon 2000	Study did not randomise participants.
Mody 2008	Study did not include diabetic foot ulcers.
Moretti 2009	Other intervention, not dressings, differ between trial arms.
Mueller 1989	Other intervention, not dressings, differ between trial arms.
Mulder 1994	The dressing groups evaluated in this study were not foam dressings.
Munter 2006	Study included a range of wound types, with data not reported separately for diabetic foot ulcers. We were unsuccessful in contacting the authors to query the availability of relevant data.
Novinscak 2010	No single, identifiable dressing type evaluated.
Ogce 2007	The dressing groups evaluated in this study were not foam dressings.
Palao i Domenech 2008	Study included a range of wound types, with data not reported separately for diabetic foot ulcers. The control arm of the study received 'local best practice' with no further information provided. The primary ou come was ulcer pain and the follow‐up period was seven days only. We were unsuccessful in contacting the authors to query the availability of relevant healing data.
Parish 2009	Other intervention, not dressings, differ between trial arms.
Pham 1999	Other intervention, not dressings, differ between trial arms.
Piaggesi 1997	Study did not randomise participants.
Piaggesi 2001	The dressing groups evaluated in this study were not foam dressings.
Reyzelman 2009	No single, identifiable dressing type evaluated.
Robson 2005	Other intervention, not dressings, differ between trial arms.
Robson 2009	Study did not include diabetic foot ulcers.
Sabolinski 2000	Other intervention, not dressings, differ between trial arms.
Sabolinski 2001	Other intervention, not dressings, differ between trial arms.
Shaw 2010	Other intervention, not dressings, differ between trial arms.
Shukrimi 2008	Other intervention, not dressings, differ between trial arms.
Sibbald 2011	Study included a range of wound types, with data not reported separately for diabetic foot ulcers. We were unsuccessful in contacting the authors to query the availability of further information.
Solway 2011	Study did not randomise participants.
Steed 1992	Other intervention, not dressings, differ between trial arms.
Steed 1995	Other intervention, not dressings, differ between trial arms.
Steed 1996	Other intervention, not dressings, differ between trial arms.
Subrahmanyam 1993	The dressing groups evaluated in this study were not foam dressings.
Trial 2010	The dressing groups evaluated in this study were not foam dressings.
Turns 2012	Study did not randomise participants.
Urbaneie‐Rovan 1999	No single, identifiable dressing type evaluated.
Vandeputte 1997	The dressing groups evaluated in this study were not foam dressings.
Varma 2006	No single, identifiable dressing type evaluated.
Veves 2001	Other intervention, not dressings, differ between trial arms.
Veves 2002	The dressing groups evaluated in this study were not foam dressings.
Whalley 2001	The dressing groups evaluated in this study were not foam dressings.
Woo 2010	Study included a range of wound types, with data not reported separately for diabetic foot ulcers. We were unsuccessful in contacting the authors to query the availability of further information.
Yao 2007	Other intervention, not dressings, differ between trial arms.
Zimny 2003	Other intervention, not dressings, differ between trial arms.