23 ms·
Is 'immortal time bias' not 'survivorship bias'?
by roel_v 8y ago
Is 'immortal time bias' not 'survivorship bias'?
- carbocation 8y agoYes, these are the same concepts. As is often the case, slightly different terminology across fields. But no difference in the main idea.
- ricree 8y agoLooking at the notice of retraction[1], "immortal time bias" seems to be a particular subset survivorship bias, in which there is a distinct delay between two events, and by definition one facet of the study only looked at those who survived that time period. In this case, the time period between diagnosis and the actual surgery. [1] - https://jamanetwork.com/journals/jamaophthalmology/fullarticle/2697405 https://jamanetwork.com/journals/jamaophthalmology/fullartic...