Dictionary of population terms
life table
Русский:
таблица смертности
Français: table
de mortalité
 one of the most important demographic tables, system
of indicators, that quantitatively describe the age changes in some
population caused by mortality. It is presented as a set of interrelated
age functions.
L.t. contains the following basic indicators:
l_{x}  the number of survived by the age x, l_{0}
 a starting point, usually 100000;
q_{x }  death probability, the probability that someone
aged exactly x will die before their (x+1)st birthday;
p_{x }  the probability of surviving from age x to age
x+1;
d_{x}  the number of deaths at age x, i.e. people who die
aged x;
L_{x}  the number of living at age x to x+1;
T_{x}  the number of coming personyears to live for those
survived by age x;
e_{x}  life expectancy at age x.
At calculation of L.t. the following relations between these indicators
are used:
p_{x} = 1q_{x; }d_{x} =
l_{x}  l_{x+1} = l_{x} * q_{x};
L_{x} = ( l_{x} + l_{x+1} ) / 2; T_{x1
} = T_{x} + L_{x1}; e_{x} = T_{x}
/ l_{x}.
The following types of life tables are distinguished:
complete life tables, where 1year age intervals are used
from 0 to 100 or 110,
abridged life tables, that use 5 or 10year age intervals,
cohort life tables or horizontal L.t. based on mortality
indicators calculated for a real cohort (generation),
vertical life tables, calculated basing on mortality indicators
of imaginary cohort for example for some calendar period,
causeofdeath life tables, that take into account influence
of separate causes on survival order.
Sources of data for calculation of L.t. are population
statistics and estimates of agesex structure of population. Calculation
of life tables for population of Russia and its regions is performed
by Federal State Statistics Service
(Rosstat, the former Goskomstat). The most important aggregated
indicator of mortality calculated basing on period life tables,
life expectancy at birth for males and females, is publiched in
The demographic
yearbook of Russia. Collection of data on mortality and calculation
of L.t. is performed also by national statistical services of other
countries. Deatiled statistical data on population deaths are collected
by The World Health Organization
from national sources and it also calculates the life tables by
countries of the world.
Life tables for population of Russia during the 30year period starting
with 1970 are placed in Informationanalytical system.
Internet databases that contain rich set of life tables by countries
of the world:
The Human LifeTable Database
The Human Mortality Database
The KannistoThatcher
Database on Old Age Mortality at the Max Planck Institute for Demographic
Research.
The informationanalytical system is developed under
the support of the Russian foundation
for humanitarian research,
project 040212003в "Development of information system of
socialdemographic data with the Internet access".
Version of page dic_lifetable.php
 1.0. Last updated 04.02.2006.
