Table 1

Quality assessment

		Qualitative research methods						Quantitative research methods

Author	Year of publication	Clear objective	Selection of study participants	Methods	Data collection	Analysis of data	Clear presentation results	Specific objective/hypothesis	Inclusion participant	Definition of outcome	Description methods and measurement	Risk of recollection bias	Participants	Presentation of results
Sánchez López et al20	2010	+	±	±	±	±	+

Carlsen and Norheim17	2008	+	+	+	+	+	+

Yew and reid16	2008	+	+	+	+	+	+

Hannes et al15	2005	+	+	+	+	+	+

Tracy et al14	2003	+	+	+	+	+	+

Freeman34	2001	+	+	+	+	±	+

Cranney et al13	2001	+	+	+	+	+	+

Oswald and Bateman19	2000	+	±	+	±	–	–

Mayer and Piterman18	1999	+	+	+	+	±	+

Kahveci and Meads32	2009							+	±	+	±	n/a	±	+

Barghouti et al31	2009							+	±	+	±	n/a	±	+

Trevena et al30	2007							±	±	+	+	n/a	±	+

Amin et al29	2006							±	±	±	±	n/a	±	±

Upton and Upton28	2006							+	+	+	+	n/a	±	+

Chan and Teng21	2005							+	+	+	+	n/a	+	+

Butzlaff et al23	2004							+	±	+	–	n/a	±	–

McKenna et al27	2004							+	+	+	+	n/a	±	±

Taylor et al26	2002							±	±	+	±	n/a	±	±

Cotton and Sullivan25	1999							+	+	+	+	n/a	±	+

McColl et al24	1998							+	+	+	±	n/a	+	+

Gupta et al22	1997							+	+	+	+	n/a	+	+

Young and Ward33	2001	+	±	±	-	-	-	+	±	+	+	n/a	+	+

Opinion of the reviewers about the quality of this item: + = positive, ± = neutral, – = negative, n/a= not applicable (cross-sectional studies).