How we evaluate evidence, calculate confidence scores, and keep content current.
High Evidence (Score 80-100)
Supported by at least one meta-analysis or systematic review, or 2+ randomized controlled trials with consistent findings. Direct population match preferred.
Moderate Evidence (Score 60-79)
Supported by randomized controlled trials or well-designed controlled studies. May have some limitations in population directness or consistency.
Low Evidence (Score 40-59)
Limited to observational studies, cohort data, or extrapolated from related populations. Reasonable mechanistic basis but needs more direct research.
Evidence Sparse (Score 0-39)
Fewer than 2 credible sources, or only mechanistic/expert consensus available. We publish these claims with explicit caveats about what research is needed.
Last Reviewed
When a human last checked this claim against current evidence
Last Updated
When content or score last changed (may differ from review date)
Version Number
Incremented on material changes (v1.0 → v1.1 for minor, v2.0 for major)
Update Reason
Why the last change was made (new meta-analysis, correction, etc.)
Every claim includes a changelog showing:
View all recent changes across the site at /corrections