Table 4.

Grading system (Downe et al., 2009)

A: No, or few flaws. The study credibility, transferability, dependability and confirmability is high

B: Some flaws, unlikely to affect the credibility, transferability, dependability and/or confirmability of the study

C: Some flaws that may affect the credibility, transferability, dependability and/or confirmability of the study

D: Significant flaws that are very likely to affect the credibility, transferability, dependability and/or confirmability of the study