Table 2.

Risk of bias for primary studies incorporating qualitative research methodologies.

Study author	Clear statement of the aims of the research?	Qualitative methodology appropriate?	Research design justified?	Recruitment strategy appropriate?	Data collection methodology appropriate?	Relationship between researcher and participants considered?	Ethical issues been taken into consideration?	Data analysis sufficiently rigorous?	Clear statement of findings?	How valuable is the research?	Overall risk of bias
Batista Ferrer H, et al. [26], [27]	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	Low
Brabin L, et al. [32]	✓	✗	✗	✓	✗	✗	✓	✓	✓	✗	High
Brown E, et al. [23]	✓	✓	✗	✗	✓	✗	✓	✓	✓	✓	Moderate
Ford C, et al. [24]	✓	✓	✗	✓	✗	✗	✓	✓	✓	✓	Moderate
Gottvall M, et al. [25]	✓	✓	✗	✓	✓	✓	✗	✓	✓	✓	Low
Hilton S, et al. [22]	✓	✓	✗	✓	✓	✗	✓	✓	✓	✓	Low
Humiston S, et al. [29]	✓	✓	✗	✓	✓	✗	✗	✓	✓	✗	Moderate
Kennedy C, et al. [30]	✓	✓	✗	✓	✓	✗	✓	✓	✓	✗	Moderate
Lee H, et al. [33]	✓	✓	✗	✗	✗	✗	✗	✗	✗	✗	High
Marshall H, et al. [31]	✓	✗	✓	✗	✓	✗	✓	✗	✓	✗	High
Remes P, et al. [28]	✓	✓	✗	✓	✓	✗	✗	✗	✓	✓	Moderate
Stretch R, et al. [21]	✓	✓	✗	✓	✓	✗	✓	✓	✓	✓	Low
Wood F, et al. [20]	✓	✓	✗	✓	✓	✗	✓	✓	✓	✓	Low