مقایسهٔ روش‌ها

	Years of Life Lost	Sullivan Method
حوزه	جمعیت‌شناسی	جمعیت‌شناسی
خانواده	Process / pipeline	Survival analysis
سال پیدایش	1994	1971
پدیدآور	Premature-mortality measure; standardized form by Christopher Murray (Global Burden of Disease)	Daniel F. Sullivan
نوع	Burden-of-disease measure of life-years lost to early death	Prevalence-based health expectancy estimator
منبع بنیادین	Murray, C. J. L. (1994). Quantifying the burden of disease: the technical basis for disability-adjusted life years. Bulletin of the World Health Organization, 72(3), 429–445.	Sullivan, D. F. (1971). A single index of mortality and morbidity. HSMHA Health Reports, 86(4), 347–354.
نام‌های دیگر	YLL, Years of Potential Life Lost, Premature Mortality Years Lost	Sullivan's Index, Sullivan Health Expectancy Method, Prevalence-Based Health Expectancy, Sullivan Yöntemi
مرتبط	4	4
خلاصه	Years of life lost (YLL) measures the burden of premature mortality by counting, for every death, how many additional years the person could have expected to live had they survived to a reference life expectancy. Summed over all deaths, YLL turns a count of deaths into a count of lost life-years, so that deaths at young ages weigh far more heavily than deaths in old age. It is the mortality half of the disability-adjusted life year (DALY) and a core metric of the Global Burden of Disease studies, letting analysts rank diseases and injuries by how much potential life they destroy rather than merely by how many people they kill.	The Sullivan method is a simple, widely used technique for estimating health expectancy — the average number of years a person can expect to live in a given health state, such as free of disability. Introduced by Daniel Sullivan in 1971, it combines an ordinary period life table with the observed age-specific prevalence of the health state, partitioning life-table person-years into healthy and unhealthy years without requiring any longitudinal transition data.