The problem of longevity and methodology of the study

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Following age-grading was based on the results of understanding between the participants of the European office of the who in Kiev (1963) on health care for elderly and old people and the prevention of premature aging. Under this agreement, to the elderly should include people aged 60-74 years old (inclusive), for those age - men 75 - 89 years, for long - lived 90 years and older.
When choosing a lower threshold longevity of the population (80 years old) were taken into consideration and the value of so-called modal (or normal) senile age mortality in the population of many developed countries within 76-80 years.
To ensure comparability of the data used it was very important to apply the unity of approaches to the collection and to the choice of methods of constructing corresponding indicators. In order to get enough reliable results, the analysis has been allocated to the group of countries with the most established by the registration of mortality and its causes.
As criteria of estimation of level of longevity of the population living in a particular territory, in the present work were applied mainly some of the indicators published tables of mortality (Life Tables). In cases where it was difficult to rough estimations were used our proposed longevity indexes, calculated on the basis of population censuses.
Long experience has shown that most fully longevity can be characterized by the following key indicators.
1. The number of those surviving up to the long years of age - up to 80 or 90 years (I80 and I 90)showing how many people out of 100 000 (or 1000) simultaneously born reaches a specified age. It is assumed that throughout the life of this generation born level age-specific mortality rates will be the same as it was in the period for which are prepared mortality tables.
2. The average life expectancy of persons aged 60 or 80 years (I 60 and I 80), showing how many years have on the average live to persons of one generation, surviving to a specified age, under the same condition as that for the previous indicator.
3. Index of longevity (table) the proportion of surviving to 80 years from the number of surviving to 60 years (I80: I60, ppm).
4. Index of longevity (perepisnye) - the share of people 80 years and older in the total number of persons 60 years and older (N80: N60, ppm).
5. The average life expectancy of newborns (10); shall be calculated by analogy with the index 2 and is used as an indicator 4, only as an additional evaluation criteria for the total estimated characteristics of the population.
In addition, in the course of clarifying the role of the main reasons limiting Douaumont to high ages, defined usual indicators age-adjusted mortality rate is the ratio of the number of deaths from particular causes of mortality and the number of population of this age (usually 100 000 people).