What do the Evidence Ratings mean?
An evidence rating is provided for all resources and tells users about the research that supports the accuracy or effectiveness of the resource.
- Three stars indicate that the benefits of the resource are supported by multiple published studies.
- Two stars indicate that the benefits of the resource are supported by one published study.
- One star indicates that an expert review of the resource has been conducted, or the information included in this factsheet has been compiled from expert review of peer-reviewed publications on this topic.