Finding and appraising qualitative evidence
Understanding Overdiagnosis bias< Back to search results
- Format Videos
- Language/s English
- Target Audience Further education
- EBM Stage 0 - Why EBM?
- Duration 5-15 mins
- Difficulty Intermediate
Key Concepts addressed
Gilbert Welch discusses overdiagnosis bias in this 14 minute video, and explains why survival ALWAYS rises following early detection — even if no one is helped.
Overdiagnosis bias is one of two explanations for why survival statistics (e.g. median survival, 5-year survival, 10-year survival) can be so misleading.
The other explanation is lead-time bias, which can be viewed at /lead-time-bias/