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“Risk cut by 50 %” can mean 1 person in 1,000.

Relative risk compares groups: if a disease drops from 2 to 1 per 1,000, that's “50 % less”. In absolute terms it's 0.1 percentage points. Headlines almost always use the relative figure because it sounds bigger. The honest question is: how many people out of 1,000 does this really affect?

Useful: For every percentage in health news, ask: percent of what?

Source: en.wikipedia.org

DenkwerkzeugStatistik

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Question on this card

A risk drops from 4 to 2 per 1,000. What's the absolute reduction?

  1. 50 %
  2. 2 percentage points
  3. 0.2 percentage points
  4. 4 %
Show the answer

Correct: 0.2 percentage points

2 out of 1,000 is 0.2 % – relatively it's 50 %.

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