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The Impact of Heterogeneity in Individual Frailty on the Dynamics of Mortality

James W. Vaupel, Kenneth G. Manton and Eric Stallard
Demography
Vol. 16, No. 3 (Aug., 1979), pp. 439-454
Published by: Springer on behalf of the Population Association of America
Stable URL: http://www.jstor.org/stable/2061224
Page Count: 16
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The Impact of Heterogeneity in Individual Frailty on the Dynamics of Mortality
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Abstract

Life table methods are developed for populations whose members differ in their endowment for longevity. Unlike standard methods, which ignore such heterogeneity, these methods use different calculations to construct cohort, period, and individual life tables. The results imply that standard methods overestimate current life expectancy and potential gains in life expectancy from health and safety interventions, while underestimating rates of individual aging, past progress in reducing mortality, and mortality differentials between pairs of populations. Calculations based on Swedish mortality data suggest that these errors may be important, especially in old age.

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