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Understanding lead-time bias
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Gilbert Welch’s 10-min video explaining why survival ALWAYS rises following early detection -- even if no one is helped.
Key Concepts addressed:Details
Gilbert Welch’s 10-min video explaining why survival ALWAYS rises following early detection — even if no one is helped. This is one of two explanations why survival statistics (e.g. median survival, 5-year survival, 10-year survival) can be so misleading.
The other explanation is overdiagnosis bias, which is discussed here:
http://en.testingtreatments.org/overdiagnosis-bias/
