Most records in the Portal's databases have been appraised for their quality of evidence using a 5-star system, where 0 is the lowest and 5 is the highest quality rating. These ratings are weighted to favour content that is based on scientific research evidence. The more stars, the higher the quality, with 5 being the maximum.
1 star: Not recommended
- This information is not based on evidence. We do not recommend following this advice.
3 stars: Do more research
- This information is based on scientific research, but possibly only from one or two studies. We recommend reading more about this topic. Use the ‘Related Topics’ links at the bottom of each resource to find higher quality information.
5 stars: Discuss with your health care professional
- This information is reliable, based on a summary of many research studies. We recommend discussing these ideas with your health care professionals.
Learn more about Web Resource Ratings
Learn more about Evidence Summaries