What are Lead-Time Bias and Length-Time Bias?

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Lead-time and length-time bias, and examples to help clarify the concepts.

Lead-time bias:

The earlier we diagnose a disease, the longer patients will appear to survive, when in fact we just started counting earlier.

Length-time bias:

Patients with slowly progressing diseases are more likely to be detected through screening

  • Format Videos
  • Language/s English
  • Target Audience Further education, Self-directed learning
  • Duration <5 mins

Key Concepts addressed


Abi Kirubarajan defines lead-time and length-time bias, and provides examples to help clarify the concepts.


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