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Life expectancy, more technically called the curtate expected lifetime and denoted , [a] is the mean of —that is to say, the expected number of whole years of life remaining, assuming survival to age . [146] So, (2) Substituting ( 1) into the sum and simplifying gives the final result [147]
Longevity may refer to especially long-lived members of a population, whereas life expectancy is defined statistically as the average number of years remaining at a given age. For example, a population's life expectancy at birth is the same as the average age at death for all people born in the same year (in the case of cohorts ).
Life table. In actuarial science and demography, a life table (also called a mortality table or actuarial table) is a table which shows, for each age, the probability that a person of that age will die before their next birthday ("probability of death "). In other words, it represents the survivorship of people from a certain population. [1]
The Healthy Life Years ( HLY) indicator, also known as disability-free life expectancy ( DFLE) or Sullivan's Index, is a European structural indicator computed by Eurostat. It is one of the summary measures of population health, known as health expectancies, [1] composite measures of health that combine mortality and morbidity data to represent ...
Years of potential life lost ( YPLL) or potential years of life lost ( PYLL) is an estimate of the average years a person would have lived if they had not died prematurely. [1] It is, therefore, a measure of premature mortality. As an alternative to death rates, it is a method that gives more weight to deaths that occur among younger people.
Life expectancies are not the same at different ages. For example, in Paleolithic era, life expectancy at birth was 33 years, but life expectancy at the age of 15 was an additional 39 years (total 54). Historically Japanese life expectancy statistics have been used as the standard for measuring premature death, as the Japanese have the longest ...
Population ageing. Population ageing is an increasing median age in a population because of declining fertility rates and rising life expectancy. Most countries have rising life expectancy and an ageing population, trends that emerged first in developed countries but are now seen in virtually all developing countries.
The Physical Quality of Life Index (PQLI) is an attempt to measure the quality of life or well-being of a country. The value is the average of three statistics: basic literacy rate , infant mortality, and life expectancy at age one, all equally weighted on a 1 to 100 scale. It was developed for the Overseas Development Council in the mid-1970s ...
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