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The quality-adjusted life year (QALY) is a generic measure of disease burden, including both the quality and the quantity of life lived. [1] [2] It is used in economic evaluation to assess the value of medical interventions. [1] One QALY equates to one year in perfect health. [2] QALY scores range from 1 (perfect health) to 0 (dead). [3]
As such, the ICER facilitates comparison of interventions across various disease states and treatments. In 2009, NICE set the nominal cost-per-QALY threshold at £50,000 for end-of-life care because dying patients typically benefit from any treatment for a matter of months, making the treatment's QALYs small. [3]
In HTAs it is usually expressed in quality-adjusted life years (QALYs). If, for example, intervention A allows a patient to live for three additional years than if no intervention had taken place, but only with a quality of life weight of 0.6, then the intervention confers 3 * 0.6 = 1.8 QALYs to the patient.
The Health Utilities Index (HUI) is a rating scale used to measure general health status and health-related quality of life (HRQoL). HUI questionnaires are designed to map onto two classification systems, HUI-2 and HUI-3, capable of measuring 24,000 and 972,000 unique health states, respectively.
The Equal Value of Life Years Gained or evLYG is a generic measure used to determine how much a medical treatment can extend the life of the patient. Unlike other healthcare metrics, the evLYG does not consider the quality of life for the patient; it exclusively considers the length of life.
Cost-effectiveness studies using QALYs, for example, do not discount time at different ages differently. [14] This age-weighting function applies only to the calculation of DALYs lost due to disability. Years lost to premature death are determined from the age at death and life expectancy.
In particular, Examples, instead of using the YPLL as defined, show the value YPLL × 100000 or use different undefined terms such as 'Person Years Lost' or YLL. Please help clarify the article. There might be a discussion about this on the talk page. (May 2016) (Learn how and when to remove this message)
The formula calculator concept can be applied to all types of calculator, including arithmetic, scientific, statistics, financial and conversion calculators. The calculation can be typed or pasted into an edit box of: A software package that runs on a computer, for example as a dialog box. An on-line formula calculator hosted on a web site.