Our friends at Compound Interest (a fantastic website and a useful resource for science educators and communicators) created a very handy infographic to provide people with A Rough Guide to the Types of Scientific Evidence. Being able to evaluate evidence behind a claim is important, but scientific evidence comes in a variety of forms. Here, different types of scientific evidence are ranked and described, particularly those related to health and medical claims.
From the weakest evidence to the strongest, they are…
- Anecdotal or “Expert” Opinions
- Animal and Cell Studies (experimental)
- Case Reports and Case Series (observational)
- Case Control Studies (observational)
- Cohort Studies (observational)
- Randomized Controlled Trials (experimental)
- Systematic Review
Click the infographic for a larger, more legible view.
Source: Compound Interest