Document Detail


Mortality-rate crossovers and maximum lifespan in advantaged and disadvantaged populations: accelerated-mortality and sudden-death models.
MedLine Citation:
PMID:  10873430     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
One population is advantaged relative to another by our definition if its survival function is greater at all ages. A population has a lifespan maximum if there is an age at which its survival function becomes exactly zero. Earlier work concerned conditions under which the mortality-rate functions of advantaged and disadvantaged populations displaying lifespan maxima always crossed. Here two survival models of populations having lifespan maxima are presented in which mortality-rate crossings between advantaged and disadvantaged subpopulations may fail to appear. One, the accelerated-mortality model, has a continuous survival function; in the other, the sudden-death model, the survival function is discontinuous. Both differ from examples examined previously in that their mortality-rate functions become infinite at their lifespan maxima.
Authors:
H R Hirsch; X Liu; T M Witten
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of theoretical biology     Volume:  205     ISSN:  0022-5193     ISO Abbreviation:  J. Theor. Biol.     Publication Date:  2000 Jul 
Date Detail:
Created Date:  2000-09-14     Completed Date:  2000-09-14     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0376342     Medline TA:  J Theor Biol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  171-80     Citation Subset:  IM    
Copyright Information:
Copyright 2000 Academic Press.
Affiliation:
Department of Physiology, University of Kentucky, Lexington, KY 40536-0298, USA.
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MeSH Terms
Descriptor/Qualifier:
Animals
Death, Sudden
Environment
Humans
Longevity*
Models, Statistical*
Species Specificity
Survival Rate*

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