Disability-adjusted life year
Disability-adjusted life year (DALY) (pronunciation: /ˈdɪsəˌbɪlɪti əˈdʒʌstɪd laɪf jɪər/) is a measure of overall disease burden, expressed as the number of years lost due to ill-health, disability or early death.
Etymology
The term was first coined in the early 1990s by the World Health Organization and the World Bank to quantify the global burden of disease. The term combines two components: years of life lost due to premature mortality (YLL) and years lived with disability (YLD).
Definition
A DALY is a measure of the gap between current health status and an ideal situation where everyone lives into old age free from disease and disability. One DALY can be thought of as one lost year of "healthy" life. The sum of these DALYs across the population, or the burden of disease, can be thought of as a measurement of the gap between current health status and an ideal health situation where the entire population lives to an advanced age, free of disease and disability.
Calculation
The calculation of DALY involves the sum of years of life lost due to premature mortality (YLL) and years lived with disability (YLD). The formula for calculating DALY is:
DALY = YLL + YLD
Related Terms
- Years of potential life lost (YPLL)
- Quality-adjusted life year (QALY)
- Health-adjusted life year (HALY)
See Also
References
External links
- Medical encyclopedia article on Disability-adjusted life year
- Wikipedia's article - Disability-adjusted life year
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