Volume 22 - Article 36 | Pages 1143–1148  

Total daily change with age equals average lifetime change

By James W. Vaupel

This article is part of the ongoing Special Collection 8 "Formal Relationships"

Abstract

In a stationary population, the change with age in some characteristic at a point in time, summed over all the individuals in the population, equals the change in this characteristic, from the start to the end of the lifetime of each individual, averaged over all lifetimes of the individuals in the cohort.

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