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What does this positive mammogram mean?
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April 28th, 2013
I read this in a recently published book:
A women without symptoms gets a mammogram screening. The result is positive. What is the likelihood of her having cancer?
A) 90%
B) 80%
C) 20%
D) 10%
About 1% of all women have breast cancer. When those who do get a mammogram, the screening will be positive in 90% of all cases. When those who don’t get a mammogram, the screening will be positive in 9% of all cases.
Source: “Risk Savvy” by Gerd Gigerenzer
The majority of doctors don’t know the correct answer. Do you?
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