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Evidence

Every claim on this site, and the study behind it

Search peer-reviewed studies and institutional reports by topic, audience, evidence strength and year.

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See also: the headline numbers and how they are changing on Statistics.

How to read the ratings

  • HighMeta-analyses, systematic reviews, large cohorts, or findings replicated by independent teams.
  • MediumA single well-designed study, or an institutional report built on published data.
  • LowSmall samples, pilot studies, models with wide uncertainty, or industry-funded work without independent replication.
  • ContestedPublished but seriously disputed, retracted, or later contradicted. We keep these so you can see why a popular claim is shaky.