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Another look at mortality crossovers

C B Nam1

  • 1Center for the Study of Population, Florida State University, Tallahassee 32312, USA.

Social Biology
|January 1, 1995
PubMed
Summary

The mortality crossover phenomenon in older adults is debated, with evidence suggesting it may be real, not just due to age misreporting. This selective frailty may explain survival differences in aging populations.

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Area of Science:

  • Demography
  • Gerontology
  • Epidemiology

Background:

  • The mortality crossover, where age-specific mortality curves intersect at older ages, is a subject of ongoing scientific debate.
  • Two primary explanations exist: artifactual causes (e.g., age misreporting) versus real biological processes (e.g., selective frailty).

Purpose of the Study:

  • To review the historical debate surrounding the reality of the mortality crossover.
  • To analyze the evidence for and against artifactual explanations versus biological mechanisms.

Main Methods:

  • Historical literature review of demographic and epidemiological studies on mortality crossover.
  • Analysis of arguments concerning age misreporting and selective frailty.

Main Results:

  • The debate highlights persistent challenges in accurately measuring mortality at advanced ages.
  • Evidence suggests the mortality crossover may persist even after accounting for potential age misreporting biases.

Conclusions:

  • The mortality crossover is likely a real phenomenon, reflecting underlying selective frailty processes in aging populations.
  • Further research is needed to fully elucidate the biological and social factors contributing to this demographic pattern.

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