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Article

Understanding variation in disease risk: the elusive concept of frailty.

International journal of epidemiology - 1 Aug 2015

Aalen Odd O, Valberg Morten, Grotmol Tom, Tretli Steinar

Abstract excerpt

The concept of frailty plays a major role in the statistical field of survival analysis. Frailty variation refers to differences in risk between individuals which go beyond known or measured risk factors. In other words, frailty variation is unobserved heterogeneity. Although understanding frailty is of interest in its own right, the literature on survival analysis has demonstrated that existence of frailty...

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Identifiers

PMID: 25501685
DOI: 10.1093/ije/dyu192
PMCID: PMC4588855

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PubMed metadata and Literature Corpus relationships. Corpus snapshot updated 7 Sept 2026. Manifest publication-graph-cohort-2026-09-08.1.

Source receipt: pubmed, retrieved 7 Sept 2026.

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