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	Healthy Life Expectancy	生命表解析
分野	人口学	人口学
系統	Survival analysis	Survival analysis
提唱年	1971	1984
提唱者	Daniel F. Sullivan (Sullivan method); developed by the WHO/REVES tradition	Demographic/actuarial tradition; Chiang
種類	Health-expectancy estimator partitioning life expectancy into healthy and unhealthy years	Age-structured mortality estimator
原典	Sullivan, D. F. (1971). A single index of mortality and morbidity. HSMHA Health Reports, 86(4), 347–354.	Chiang, C. L. (1984). The Life Table and Its Applications. Robert E. Krieger Publishing. ISBN: 978-0-89874-565-2
別名	HALE, Health-Adjusted Life Expectancy, Disability-Free Life Expectancy	Mortality Table, Actuarial Table, Survival Table, Yaşam Tablosu
関連	4	3
概要	Healthy life expectancy partitions ordinary life expectancy into the years a person can expect to live in good health and the years expected to be lived with disability or ill health. Building on the life table, the classic Sullivan method weights each age interval's person-years by the prevalence of good health, so the resulting expectancy answers not just 'how long will people live?' but 'how many of those years will be healthy?'. It has become a headline summary of population health, reported by the World Health Organization as HALE and tracked alongside life expectancy to judge whether longer lives are also healthier lives.	A life table is a systematic, age-structured summary of the mortality experience of a population. It traces a hypothetical cohort of births — conventionally 100,000 — through successive age intervals, recording how many survive, how many die, and how many person-years are lived at each interval. The method was formalized in its modern probabilistic form by Chiang (1984), synthesizing centuries of actuarial and demographic practice into a rigorous statistical framework applicable to human and biological populations alike.