Health-adjusted life expectancy (HALE) is the average number of years that a person can expect to live in full health. HALE is calculated by subtracting from the life expectancy the average number of years in ill-health weighted for severity of the health problem.
WHO uses life tables and Sullivan's method to compute the HALE for countries. Briefly, HALE is estimated using three sources of information: the fraction of the population surviving to each age, calculated from birth and death rates; the prevalence of each type of disability at each age; and the weight assigned to each type of disability, which may or may not vary with age (WHO, 2000c). For more information see: HALE Method according to WHO Statistical Information System
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Literature and data sources
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