Study	Reason for exclusion
Abbott 2010	Insufficient psychotherapeutic content
Abrahamsen 2008	Hypnosis study
Appelbaum 1988	Inadequate n: the number of patients in any treatment arm was less than 10
Asenlof 2005	Not chronic pain
Astin 2003	Insufficient psychotherapeutic content
Babu 2007	N < 20
Becker 2000	Insufficient psychotherapeutic content (participants could opt out of psychology and 71% did)
Bendix 1997	Insufficient psychotherapeutic content
Bradley 1987	N < 20
Broderick 2004	Insufficient psychotherapeutic content
Brox 2003	Insufficient psychotherapeutic content
Buhrman 2004	Internet trial
Carson 2005	Insufficient psychotherapeutic content
Carson 2010	Insufficient psychotherapeutic content
Castel 2009	n < 10
Christiansen 2010	Not all had chronic pain
Cook 1998	N < 20
Corrado 2003	No primary psychological treatment for pain or non‐psychological comparator
Currie 2000	No primary psychological treatment for pain or non‐psychological comparator
Dahl 2004	N < 10
Dalton 2004	Not chronic pain
de Sousa 2009	Insufficient psychotherapeutic content
Dufour 2010	Insufficient psychotherapeutic content
Dworkin 1994	Intervention pre‐dental procedure: no outcome of psychology intervention available
Dworkin 2002a	Insufficient psychotherapeutic content
Dworkin 2002b	Insufficient psychotherapeutic content
Edinger 2005	No primary psychological treatment for pain or non‐psychological comparator
Ersek 2003	N < 20
Esmer 2010	Insufficient psychotherapeutic content
Evans 2003	Not chronic pain
Fairbank 2005	Cross‐over trial and data on outcome collected after cross‐over
Ferrari 2006	Not clearly randomised
Flor 1993	N < 20
Fors 2000	Insufficient psychotherapeutic content
Freeman 2002	Insufficient psychotherapeutic content
Garcia‐Campayo 2009	Trial plan not trial
George 2008	Insufficient psychotherapeutic content
Glombiewski 2010a	Not a treatment trial
Haugstad 2006	Insufficient psychotherapeutic content
Jensen 2009	Hypnosis study
Johansson 1998	N < 20
Kapitza 2010	Insufficient psychotherapeutic content
Keefe 2004	N < 20
Keller 2004	Insufficient psychotherapeutic content
Kerns 1986	N < 10
Kroenke 2009	Insufficient psychotherapeutic content
Lamb 2010	Insufficient psychotherapeutic content
Lambeek 2009	Insufficient psychotherapeutic content
Li 2006	Insufficient psychotherapeutic content
Liedl 2011	N < 20
Linton 1984	N < 10
Linton 1985	N < 10
Linton 2001	Not chronic pain
Linton 2005	Not chronic pain
Linton 2008	N < 20
Lorig 2008	Internet trial
Machado 2007	Insufficient psychotherapeutic content (counselling)
Marhold 2001	N < 20
Menzel 2006	N < 10
Moffett 2005	Insufficient psychotherapeutic content
Moore 1985	N < 20
Moore 2000	Not chronic pain
Morone 2008	Insufficient psychotherapeutic content
Morone 2009	Insufficient psychotherapeutic content
Newton‐John 1995	N < 20
Nicholas 1991	N < 10
Nicholas 1992	N < 10
O'Leary 1988	N < 20
Parker 2003	Intervention for depression not pain
Peters 1990	N < 10
Radojevic 1992	N < 20
Redondo 2004	N < 20
Rendant 2011	Insufficient psychotherapeutic content
Sahin 2011	Insufficient psychotherapeutic content
Schulze 2008	Not random allocation
Schweikert 2006	Insufficient psychotherapeutic content
Sharpe 2001	Not chronic pain
Smeets 2009	Study of predictors not outcomes of intervention
Soderlund 2001	Insufficient psychotherapeutic content
Spence 1989	N < 20
Spence 1995	N < 20
Strong 1998	Insufficient psychotherapeutic content
Turner 1982	N < 10
Turner 1990	N < 20
Turner 1993	N < 20
Turner 2011	Insufficient psychotherapeutic content
Turner‐Stokes 2003	Equivalence trial
Van den Hout 2003	Not chronic pain
Van Lankveld 2004	No primary psychological treatment for pain or non‐psychological comparator
Vlaeyen 1995	N < 20
Wicksell 2008	N < 20
Wong 2011	Insufficient psychotherapeutic content
Woods 2008	N < 20