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Confidence levels explained

A confidence level tells you how much to trust a figure, based on source reliability, freshness and corroboration.

A confidence level tells you how much to trust a figure, based on source reliability, freshness and corroboration.

ConfidenceWhat drives it
HighA reliable source, collected recently, often corroborated elsewhere
MediumA reasonable source, but ageing, or with no corroboration
LowA weaker source, stale, or where sources disagree

Notes

A low-confidence figure is not necessarily wrong, only less certain. Treat it as a starting point to verify rather than a fact to rely on directly. See When two sources disagree for one common cause of lower confidence.

Last verified 30 July 2026

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