2 · Two letters
Imagine two letters about the same procedure. Read them slowly.
The first says: “90 out of 100 people are doing well a month after this procedure.”
The second says: “10 out of 100 people are not doing well a month after this procedure.”
Now imagine a headline: “Common habit doubles your risk!” Then the details underneath: the risk goes from 1 in 10,000 people to 2 in 10,000.
Notice how each version felt. The facts did not change, but did your reaction? Which version would make you more likely to say yes, or more likely to worry?
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3 · Another view
The two letters say exactly the same thing. Researchers call this framing: the same fact feels different depending on whether it is described as a gain or a loss.
The headline is also true, but “doubles” sounds alarming when the real change is from 1 in 10,000 to 2 in 10,000. This is the difference between relative risk (“twice as much”) and absolute risk (how many people out of how many).
When reading health information, it helps to ask: Out of how many people? Compared with what? And who is telling me this, and why?
Helpful questions
“Doubles the risk”
Ask: From what, to what? 1 in 10 to 2 in 10 is very different from 1 in 10,000 to 2 in 10,000.
“90% success”
Ask: What happens to the other 10%? And what are the alternatives?
A frightening story
Ask: How common is this? Vivid stories can feel more likely than they are.
A brief history of framing
1981 — Amos Tversky and Daniel Kahneman publish “The Framing of Decisions,” showing that people choose differently when the same options are described as lives saved or lives lost.
1982 — A study in The New England Journal of Medicine finds that patients and even doctors choose differently between treatments depending on whether results are described as survival or death rates.
2000s — Researchers including Gerd Gigerenzer promote “natural frequencies” such as “10 out of 100 people” to make health risks easier to understand.
The numbers didn’t change. Only the words did.
You do not have to accept this view. Just notice how it sits with you.
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