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Diagnosed earlier does not mean lived longer.

If a disease is normally found at 60 and someone dies at 65, the statistic records five years of survival. If screening finds the same disease at 55 and death still comes at 65, it suddenly reads ten years. Nothing was gained – only the measurement's starting point moved.

Useful: For screening, mortality tells you more than survival time does.

Source: en.wikipedia.org

DenkwerkzeugStatistik

Difficulty:

Question on this card

What does lead time bias describe?

  1. That screening is always harmful
  2. That earlier diagnosis lengthens measured survival without lengthening life
  3. That doctors diagnose too late
  4. That control groups are missing
Show the answer

Correct: That earlier diagnosis lengthens measured survival without lengthening life

Only the start of the measurement moves; the date of death stays the same.

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