Risk of bias
All the eligible studies had a low risk of bias – showing a high
percentage of positive answers to the questions of the JBI tool. The few
negative answers were related to how the measurement was conducted, if
the evaluators were trained, and the description of the comparison
between the study sample and dropouts. JBI quality appraisal criteria
showed that the quality score of the included studies ranged between
81% and 100%, except one study had a score of 63%. Therefore, no
studies with a high risk of bias were included in this review. The risk
of bias assessment is presented in Table 4.