Published online by Cambridge University Press: 22 April 2026
Survivors are not a random sample of patients with disease, they are biased. How they differ from non-survivors must be understood before survival can be attributed to a disease process, or therapeutic intervention. Live-birth bias is a particular example; many conceptions fail before term birth and this influences the live-birth population. The importance of collider bias is reviewed. Workers are generally healthier than those not working introducing bias into occupational health studies.
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