Table 2.

The Newcastle-Ottawa scale (NOS) for cross-sectional studies for the assessment of quality of surveys included in this scoping review. This summary does not include single results for subsections.

Study	Selectiona (maximum 5 stars)	Comparability (maximum 2 stars)	Outcome (maximum 3 stars)	Total score (maximum 10 stars)
Klein and Cook [42]	***	-	**	*****
Casey et al [43]	****	*	**	*******
Eichenberg et al [44]	***	-	**	*****
Musiat et al [6]	***	-	**	*****

^aOne star for sample size “justified and satisfactory” was only given when the sample was representative or when both a justification for the sample size (eg, power analyses) and a satisfactory sample size were reported.