Disability-adjusted life years
Disability-adjusted life years (DALYs) (pronounced: /ˈdæli/) is a measure of overall disease burden, expressed as the number of years lost due to ill-health, disability or early death. The term was first coined in the 1990s by the World Health Organization and the World Bank to quantify the global burden of disease.
Etymology
The term "Disability-adjusted life years" combines two components: years of life lost due to premature mortality (YLLs) and years lived with disability (YLDs). The term was developed to provide a single health gap measure that can be used to assess and compare the overall health of different populations.
Definition
DALYs for a disease or health condition are calculated as the sum of the Years of Life Lost (YLL) due to premature mortality in the population and the Years Lost due to Disability (YLD) for people living with the health condition or its consequences.
Calculation
The calculation of DALY involves the following steps:
- Calculation of Years of Life Lost (YLL) due to premature mortality.
- Calculation of Years Lived with Disability (YLD) for incident cases of the health condition.
- Addition of YLL and YLD to get DALY.
Related Terms
- Years of Life Lost (YLL)
- Years Lived with Disability (YLD)
- Quality-adjusted life years (QALY)
- Health-adjusted life expectancy (HALE)
See Also
External links
- Medical encyclopedia article on Disability-adjusted life years
- Wikipedia's article - Disability-adjusted life years
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