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

• 1-2j Earlier is not necessarily better

Details

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/