Study	Reason for exclusion
Al‐Mandeel 1998	No control group
Berman 1999	No control group
Berman 2008	HSE gel (hydrocortisone, silicone and vitamin E) compared with onion extract, i.e. not silicone gel sheeting
Chan 2005	Used paint‐on silicone (not silicone gel sheet)
Chernoff 2007	No differentiation in outcome reporting between hypertrophic and keloid scars and post‐laser exfoliation erythema
Chuangsuwanich 2000	No control group
Clugston 1995	Non human subjects
D'Andrea 2002	Silicone not the only intervention (combined with surgery)
de Giorgi 2009	Patients with surgical wounds; zinc oxide cream compared with silicone gel, i.e. not silicone gel sheeting
Dockery 1994	No control group
Donati 1991	No control group
Fulton 1995	No control group
Gold 1993	No control group
Harte 2009	Patients with hypertrophic burn scars; pressure garments versus pressure garments and silicone gel sheeting, therefore silicone gel sheeting not used on own
Hirshowitz 1993	No control group
Hollands 1999	Concentrates on local biochemical changes in skin (i.e. does not look at clinical outcomes such as scar size, colour, volume)
Hosnuter 2007	No control group
Jenwitheesuk 2012	Not silicone gel sheeting alone (was combined with onion extract)
Katz 1995	No control group
Klopp 2000	Silicone gel sheeting was applied in combination with pressure garment (not on own)
Lee 1996	No control group
Loeding 1993	silicone gel (not silicone gel sheeting) for hand injuries
Mercer 1989	No control group
Musgrave 2002	Outcome measured was effects on blood flow and perfusion
Muti E 1994	No control group
Nikkonen 2001	No control group
Reish 2008	Discussion paper on scar treatments only, i.e. not a clinical trial
Ricketts 1996	Non randomised pairs study that concentrates on local biochemical changes in skin (i.e. does not look at clinical outcomes such as scar size, colour, volume)
Sawada 1990	Used silicone cream (not gel sheet)
Shigeki 1999	Concentrates on local biochemical changes in skin (i.e. does not look at clinical outcomes such as scar size, colour, volume)
Signorini 2007	Used paint‐on silicone (not silicone gel sheet)
So 2003	Intervention patient education; both groups received silicone gel
Steinstraesser 2011	Silicone gel sheeting was applied in combination with pressure garment (not on own)
Stoffels 2010	Patients with hypertrophic scars; placebo compared with topical silicone spray (not silicone gel sheeting)
Suetake 2000	Concentrates on local biochemical changes in skin (i.e. does not look at clinical outcomes such as scar size, colour, volume)
Van den K 2001	Silicone gel sheeting was applied in combination with pressure garment (not on own)
van der Wal 2010	Topical silicone gel not sheeting
Widgerow 2000	No control group. Combines silicone gel sheet with surgery and steroids (injection and cream), i.e. no patients received silicone gel only