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Immortal time bias in survival analysis

By: Simon Knight | Posted on 17th December 2018

Whilst reviewing an article submitted to a transplant journal recently, my attention was brought to an issue that is often overlooked in survival analysis, called ‘immortal time bias’. The issue arises when the groups to be compared in the analysis are defined by a time-dependent event that can occur any time during follow-up. As standard […]

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