Table 3.

The methodological quality of the included studies evaluated by the Joanna Briggs Institute-Checklist for Prevalence Studies.

	Nacul et al., [26]	Lindal et al., [13]	Rimes et al., [27]
1. Appropriate sample frame	Yes	Yes	Yes
2. Participants were sampled appropriately	Yes	Yes	Yes
3. Adequate sample size	Yes	Yes	Yes
4. Participants and settings were well described	Yes	Yes	Yes
5. Data analysis with sufficient coverage	Yes	No/Unclear	Yes
6. Valid methods for identifying the condition	Yes	No/Unclear	Yes
7. Standard and reliable measure of the condition	Yes	Yes	Yes
8. Appropriate statistical analyses	Yes	Yes	Yes
9. Adequate response rate	Yes	Yes	No/Unclear