Table 3.

Quality assessment of studies

	Screening (yes/no/unclear)		Methodological quality criteria - Quantitative non-randomised (yes/no/unclear)
Study	Clear research question	Relevant data	3.1 Selection bias minimised	3.2 Appropriate measurements	3.3 Comparable participants	3.4 Outcome data for 80% or above
Holden et al., 2012 [37]	Yes	Yes	Yes	Yes	Yes	Unclear
	Screening (yes/no/unclear)		Methodological quality criteria - Qualitative (yes/no/unclear)
Study	Clear research question	Relevant data	1.1 Relevant sources of data	1.2 Relevant data analysis	1.3 Consideration of context	1.4 Consideration of researchers’ influence
Bamberg et al., 2010 [40]	Yes	Yes	Yes	Yes	Yes	Unclear
Cooke et al., 2008 [29]	Yes	Yes	Yes	Yes	Yes	Yes
Golenko et al., 2012 [33]	Yes	Yes	Yes	Yes	Yes	Yes
Hulcombe et al., 2014 [9]	Yes	Yes	Yes	Unclear	Yes	Unclear
Whitworth et al., 2012 [41]	Yes	Yes	Yes	Unclear	Yes	Unclear