6

Quality assessment for included studies using the Delphi List

Study ID	Allocation randomised	Allcoation concealed	Inclusion criteria specified	Baseline similar	Blinded outcome assessment	Blinded care provider	Blinded participants	Point estimate & variability	Intention‐to‐treat
Asenlof 2005	Yes	Don't know	Yes	Yes	No	No	No	Yes	Yes
Barlow 2000	Yes	Yes	Yes	Yes	No	No	No	Yes	Yes
Basler 2007	Yes	Yes	Yes	Yes	Yes	No	No	Yes	Yes
Bernaards 2007	Yes	Yes	Yes	Yes	No	No	No	Yes	Yes
Blixen 2004	Yes	Don't know	Yes	Yes	Yes	No	No	Yes	No
Carr 2005	Yes	Yes	Yes	Yes	No	No	No	Yes	Don’t know
Cohen 1983	Don't know	Don't know	Yes	Yes	No	No	No	No	Don't know
Ersek 2004	Yes	Don't know	Yes	Yes	Yes	No	No	Yes	Yes
Ettinger 1997	Yes	Yes	Yes	Yes	Yes	No	No	Yes	Yes
Ferreira 2007	Yes	Yes	Yes	Yes	No	No	No	Yes	Yes
Fransen 2007	Yes	Yes	Yes	Yes	Yes	No	No	Yes	Yes
Friedrich 1996	Yes	Don't know	Yes	Yes	Yes	No	No	Yes	Yes
Friedrich 1998	Yes	Don't know	Yes	Yes	Yes	No	No	Yes	Don’t know
Fries 1997	Yes	Don't know	No	Yes	No	No	No	Yes	Don't know
Halbert 2001	Yes	Don't know	Yes	Yes	No	No	No	Yes	Yes
Harkapaa 1990	Yes	Don't know	Yes	Yes	No	No	No	No	No
Huang 2003	Yes	Yes	Yes	Don't know	Don't know	Don't know	Don't know	Yes	No
Huang 2005	Yes	Yes	Yes	Yes	Don't know	No	Don't know	Yes	No
Hughes 2004	Yes	Don't know	Yes	No	No	No	No	Yes	No
Hurley 2007	Yes	Yes	Yes	Yes	Yes	No	No	Yes	Yes
Jensen 2001	Yes	Yes	Yes	Don't know	No	No	No	Yes	Yes
Koumantakis 2005	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes
Lorig 1985	Yes	Don't know	No	No	No	No	No	Yes	Don't know
Luszczynska 2006	Yes	Don't know	Yes	Yes	No	No	No	Yes	Don't know
Mangione 1999	Yes	Don't know	Yes	Yes	Don't know	No	Don’t know	Yes	Yes
McCarthy 2004	Yes	Don't know	Yes	Yes	Yes	No	No	Yes	Yes
Mikesky 2006	Yes	Don't know	Yes	Yes	Yes	No	No	Yes	Yes
Minor 1989	Yes	Don't know	Yes	Yes	Don't know	No	No	Yes	No
Nour 2006	Yes	Don't know	Yes	Yes	Yes	No	No	Yes	Yes
Petrella 2000	Yes	Yes	Yes	No	Yes	No	Yes	Yes	Yes
Schoo 2005	Yes	Don't know	Yes	Yes	No	No	No	No	No
Sherman 2005	Yes	Yes	Yes	No	Yes	No	No	Yes	Yes
Smeets 2006	Yes	Yes	Yes	Yes	No	No	No	Yes	Yes
Soderlund 2001	Yes	Don't know	Yes	Yes	Yes	No	No	Yes	No
Song 2003	Yes	Don't know	Yes	Yes	Don't know	No	No	Yes	No
Soukup 1999	Yes	Don't know	Yes	Yes	No	No	No	Yes	Yes
Taimela 2000	Yes	Don't know	Yes	Yes	Yes	No	No	Yes	Yes
Talbot 2003	Yes	Don't know	Yes	Yes	No	No	No	Yes	No
Veenhof 2006	Yes	Yes	Yes	Yes	Yes	No	No	Yes	Yes
Viljanen 2003	Yes	Yes	Yes	No	No	No	No	Yes	Yes
Yip 2007	Yes	Don't know	Yes	Yes	Don't know	No	No	Yes	Yes
Ylinen 2003	Yes	Yes	Yes	Yes	Yes	No	No	Yes	Yes