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Demography

, Volume 42, Issue 2, pp 243–258 | Cite as

Three dimensions of the survival curve: horizontalization, verticalization, and longevity extension

  • Siu Lan Karen Cheung
  • Jean-Marie Robine
  • Edward Jow-Ching Tu
  • Graziella Caselli
Article

Abstract

Three dimensions of the survival curve have been developed: (1) “horizontalization,” which corresponds to how long a cohort and how many survivors can live before aging-related deaths significantly decrease the proportion of survivors; (2) “verticalization,” which corresponds to how concentrated aging-related (“normal”) deaths are around the modal age at death (M); and (3) “longevity extension,” which corresponds to how far the highest normal life durations can exceed M. Our study shows that the degree of horizontalization increased relatively less than the degree of verticalization in Hong Kong from 1976 to 2001. After age normalization, the highest normal life durations moved closer to M, implying that the increase in human longevity is meeting some resistance.

Keywords

Survival Curve Premature Mortality Maximum Life Span Human Longevity Life Duration 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Population Association of America 2005

Authors and Affiliations

  • Siu Lan Karen Cheung
    • 1
  • Jean-Marie Robine
    • 2
  • Edward Jow-Ching Tu
    • 3
  • Graziella Caselli
    • 4
  1. 1.INSERM/D’emographie et Santé, Val d’Aurelle, Parc EuromédecineMontpellier cedex 5France
  2. 2.Démographie et SantéINSERMFrance
  3. 3.Hong Kong University of Science and TechnologyChina
  4. 4.University of Rome “La Sapienza.”RomeItaly

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