Figure 2.

The summary results of the evaluation of studies using a Joanna Briggs classification. Q1—Was the sample frame appropriate to address the target population?; Q2—Were study participants recruited in an appropriate way?; Q3—Was the sample size adequate?; Q4—Were the study subjects and setting described in detail?; Q5—Was data analysis conducted with sufficient coverage of the identified sample?; Q6—Were valid methods used for the identification of the condition?; Q7—Was the condition measured in a standard, reliable way for all participants?; Q8—Was there appropriate statistical analysis?; Q9—Was the response rate adequate, and if not, was the low response rate managed appropriately?; Y—yes; N—no; U—unclear; and *—the question did not apply to 37 studies.