Table 1

Overview of included studies

Author	Year	Location	Sample size	Participant age	Questionnaire used	Treatment phase
Hodgkinson	2006	Australia	54	58.2	HADS	Post-treatment
Wenzel	2002	USA	49	55.9	CES-D	Post-treatment
Liavaag	2007	Norway	189	59.3	HADS	Post-treatment
Hipkins	2004	UK	63	58.2	HADS	Pretreatment and post-treatment
Bisseling	2009	Australia	62	36.5	HADS	Post-treatment
Norton	2004	USA	143	55.0	BDI	On-treatment
Parker	2006	USA	126	58.7	CES-D	On-treatment
Goncalves	2008	UK	121	61.1	HADS	On-treatment and post-treatment
Costanzo	2005	USA	61	60.1	CES-D	Pretreatment
Price	2010	Australia	798	60.0	HADS	Pretreatment, treatment
Sukegawa	2008	Japan	27	50.1	STAI	On-treatment
Liavaag	2007	Norway	189	57.8	HADS	On-treatment
Price	2009	Australia	613	60.5	HADS	Pretreatment and on-treatment
Goncalves	2010	UK	21	58.8	HADS	Pretreatment and post-treatment
Slovacek	2009	Czech Republic	30	62.1	SDS	On-treatment
Lutgendorf	2009	USA	19	61.0	CES-D and BDI	Pretreatment
Schulman-Green	2008	USA	84	60.8	STAI and CES-D	Pretreatment
Stafford	2010	Australia	71	58.5	HADS	On-treatment and post-treatment
Urbaniec	2011	Australia	21	56.7	BDI and STAI	Post-treatment
Clevenger	2013	USA	301	59.4	CES-D	Pretreatment, on-treatment and post-treatment
Holzner	2003	Austria	98	57.4	HADS	Post-treatment
Lutgendorf	2008	USA	56	63.5	CES-D	Pretreatment
Lutgendorf	2008	USA	86	55.6	CES-D	Pretreatment
Meraner	2012	Austria	55	52.8	HADS	Pretreatment, on-treatment and post-treatment

BDI, Beck Depression Inventory; CES-D, Centre for Epidemiologic Studies Depression Scale; HADS, Hospital Anxiety and Depression Scale; SDS, Self-Rating Depression Scale; STAI, State-Trait Anxiety Scale.