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Why is number of various average life expectancies and healthy life expectancy calculated?

Last update date March 18, 2019

As for average life expectancy and the healthy life expectancy, different number is calculated by type and point of calculation method and population statistics data. It is important to grasp what is used for calculation method and population statistics data of each data than which is not right definitely.

Various average life expectancies of various values of 2010
NoLife tables which become the causeThe whole countryYokohama-shi
ManWomanManWoman
1Complete life table (country announces)79.5586.30
2Abridged life table (country announces)79.6486.39
3Life table (country announces) according to the metropolis and districts79.5986.3580.2986.79
4Life table (country announces) according to municipality79.686.480.386.8
5Yokohama-shi calculates originally (the Chan method)80.1886.63
6Yokohama-shi calculates originally (we use healthy life expectancy calculation program)80.4286.98

Average life expectancy

1 complete life table

2 abridged life tables

Calculation of average life expectancy needs making of life table. We supposed that the situation of the death of a certain group would not change with life table in future and people in each age could live for another several years on the average or calculated (average life span). We can know average life expectancy if we look at place whether 0-year-old person can live for another several years. National representative life table has complete life table and abridged life table. Complete life table is made based on Japanese population (the number of the decisions) and vital statistics (the number of the decisions) by national census every five years, and abridged life table is made based on population and vital statistics monthly report age meter by population by estimate of Japanese people (round numbers) every year. In addition, about the national census year, both abridged life table and complete life table are made, but complete life table has character to be for decision.

Life table according to 3 metropolis and districts

Based on population (the number of the decisions) by anteroposterior vital statistics (the number of the decisions) including the national census year of 3 years and national census of Japanese people, it is made according to the metropolis and districts every five years. Value is different from average life expectancy of the complete life table whole country in making method of this life table. Country recommends that they use life table according to the metropolis and districts in average life expectancy of the metropolis and districts (they include Yokohama-shi) in complete life table in national average life expectancy.

Life table according to 4 municipalities

Making method of this life table is different from life table according to complete life table and the metropolis and districts. The whole Yokohama-shi and value of each ward are published here, but it is recommended in the whole city that we use life table according to the metropolis and districts. We are announced only to the decimal point first place. It is made every five years.

Average life expectancy (the Chan method) that 5 Yokohama-shi calculated originally

We use the Chan method who does not use general Bayes estimation in Yokohama-shi whereas country calculates calculation of average life expectancy by method called Bayes estimation. This is because program of Bayes estimation that country uses is not announced. It was original temporarily and calculated that it was every five years that country announced average life expectancy of Yokohama-shi and took time before public announcement.

Average life expectancy (we use healthy life expectancy calculation program) that 6 Yokohama-shi calculated originally

Healthy life expectancy was calculated based on questionnaire result and population statistics of the people's life basics investigation investigated every three years, but Ministry of Health, Labour and Welfare study group (chief researcher = Shuji Hashimoto, Fujita Health University's professor) (the following study group) announced only number of the metropolis and districts until June, 2014 and did not announce number of Yokohama-shi. Therefore we applied to country for data offer for Yokohama-shi of questionnaire result of the people's life basics investigation in Yokohama-shi and calculated healthy life expectancy of Yokohama-shi using calculation program that study group provided from provided data originally. Average life expectancy is calculated on calculating healthy life expectancy by calculation program because life table is made. Reasons that we further calculate average life expectancy of "average life expectancy (we use healthy life expectancy calculation program) that 6 Yokohama-shi calculated originally" in addition to "average life expectancy (the Chan method) that 5 Yokohama-shi calculated originally" here and announced are as follows. "Average life expectancy = healthy life expectancy + for "everyday life if "average life expectancy" that was calculated by same calculation program and population statistics data when explain in implication of generally plain healthy life expectancy of average of period with limit" is not "average during period with limit for everyday life" with "healthy life expectancy", is because there is not in "average life expectancy" even if add "average during period with limit to everyday life" with "healthy life expectancy".
Confusion is seen in part here in country. For example, number of health Japan 21 (the second) is the same as study group, but "average (differences between average life expectancy and healthy life expectancy) during period with limit is different in national healthy life expectancy of 2010 for everyday life". This is because we use thing of complete life table for average life expectancy in health Japan 21 (the second) whereas we use same population statistics data and calculation method for healthy life expectancy and calculation of life table in study group.

Healthy life expectancy calculation program
Average (healthy life expectancy) of period when everyday life does not have limit
Study group of countryMention of healthy Japanese 21 (the second) p25
Male 70.42 years oldMale 70.42 years old
Woman 73.62 years oldWoman 73.62 years old
For everyday life average (differences between average life expectancy and healthy life expectancy) of period with limit
Study group of countryMention of healthy Japanese 21 (the second) p25
Male 9.22 years oldMale 9.13 years old
Woman 12.77 years oldWoman 12.68 years old

Healthy life expectancy

By the above-mentioned circumstances, Yokohama-shi calculated healthy life expectancy originally in December, 2012, but study group announced healthy life expectancy of 20 big cities including Yokohama-shi in July, 2014. Value announced here is different from value that Yokohama-shi calculated originally, but it is thought that it is caused by the fact that it is slightly different that study group used count time of population that we are based and used.

But in the study group, about "detailed method, it is not fixed that which method is right which basic number use when calculate healthy life expectancy. We state, it may be said that it is number right each if we state that you calculated how clearly using which basic number even if different from number that study group calculated.

In addition, there are other various calculation methods for healthy life expectancy. For example, it is methods to subtract "average during period with limit from there for everyday life" using average life expectancies according to the metropolis and districts which country announced particularly, and to calculate healthy life expectancy without demanding "average of period with limit from data and population statistics provided in the people's life basics investigation, and using life table arrived at by the same population statistics for everyday life".

It is what, or, as for the healthy life expectancy, do questionnaire item “ you of the people's life basics investigation said to be "average of period when everyday life does not have limit" this time influence moreover everyday life by currently health problem? We calculate based on answer to "result. However, how is current health condition of “ you of "average of period when we are aware that oneself is healthy?" There is way of thinking to calculate based on questionnaire answer result called ". How to find healthy life expectancy is globally different in every country.

The number of the data of the people's life basics investigation that are questionary survey decreases to demand healthy life expectancy of distinction in Yokohama-shi when it becomes according to 18 wards, and calculation becomes incorrect. Therefore we calculated mean independence period (but this is said to be one of the types of healthy life expectancy, too ...) of distinction in substitution for healthy life expectancy originally in Yokohama-shi. This calculates using The Long-term Care Insurance data which Yokohama-shi holds in substitution for data of the people's life basics investigation. For "everyday life is based on way of thinking called ≒ "period to need care" during period with limit", and even many other municipality calculates this value, and say with reference level of health measure. But difference is considerably seen in number with healthy life expectancy.

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Health and Social Welfare Bureau institute for health infectious disease, epidemiology Information Systems Section

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Telephone: 045-370-9237

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