Health-adjusted life years

Health-adjusted life years (HALYs) are commonly used in public health to quantify the burden of a disease and compare the cost-effectiveness of different health interventions.

HALYs are a combined measure of morbidity and mortality. Mortality is measured by the number of years a person died before expected (Years of Life Lost). Morbidity is measured by the number of years a person lives with a specific disability, weighted by its severity (Years of Life Lived with Disability).

Quality adjusted life years (QALYs) and disability adjusted life years (DALYs) are the most common forms of HALYs, with the two most important differences being (i) DALYs express a loss, while QALYs express a gain and (ii) different weightings are applied to different disabilities....

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