The rating system
How useful are different treatments?
- These treatments are very useful. They are strongly supported as effective by scientific evidence.
- These treatments are useful. They are supported by scientific evidence as effective, but the evidence is not as strong.
- These treatments are promising and may be useful. They have some evidence to support them, but more evidence is needed to be sure they work.
- These treatments have not been properly researched. It is not possible to say whether they are useful or not.