[The actually observed dependence of mortality on age--a consequence of the normal distribution of individuals in a cohort by the "vitality" criterion].
A mathematical model is elaborated to calculate mortality indices in a cohort under various conditions. It is based on experimental data on compensatory mortality, differences of character dispersions between males and females, linear time dependence of compensatory effects. Observed dependence of mortality on age may be obtained under provision of normal distribution of individuals by "vitality". 7 functional relations that describe variation of "vitality" dependently on time scale are considered. It is concluded that there must be obligatory longevity limit which is responsible for mortality dynamics: increased mortality in younger ages, its correspondence to Hompertz-Meykem low in middle age, and drastic retardation of mortality increasing in older age.
Il'chenko
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AV
D000328:Adult; D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging; D015331:Cohort Studies; D005260:Female; D006801:Humans; D008017:Life Expectancy / Q000639:trends*; D008297:Male; D008875:Middle Aged; D015233:Models, Statistical; D009026:Mortality / Q000639:trends*; D017678:Sex Distribution; D013997:Time Factors
Real'no nabliudaemaia zavisimost' smertnosti ot vozrasta--sledstvie normal'nogo raspredeleneiia osobeĭ v kogorte po kriteriiu "vital'nosti".