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Quality adjusted life years(QALYs).pptx
- 1. Quality adjusted life years(QALYs) Preparedby: Ranjana Koirala MPH 1st year KISTMCTH
- 2. Introduction The quality-adjustedlife year or quality-adjusted life-year (QALY) is a generic measure of disease burden, including both the quality and the quantity of life lived. It is used in economic evaluation to assess the value of medical interventions. One QALY equates to one year in perfect health. QALY are a measure of the BoD based on an estimate of the quality and quantity of additional years of life after a medical intervention.
- 3. Defining and Measuringa QALY Each year in perfect health is assigned the value of 1.0. If extra years are lived with disability, then the extra years of life without perfect health are assigned a value between 0 and 1 depending on the nature of the disability. The weighting of values is usually calculated by methods including visual analog scales, standard gamble, and time-trade-off. This measure of QOL is challenged by those who claim that it is difficult to define perfect health. Others argue that there are some health states with severe suffering that should be assigned negative values because they are worse than death. Finally, the impact of a patient's health status on the QOL of family and friends is not included in this measure.
- 4. Aim of measuringQALYs The QALY is commonly used in health economic evaluations as a means of quantifying the health effect of a medical intervention or a prevention program and ultimately to help payers allocate healthcare resources. QALYs can be used to inform health insurance coverage determinations, treatment decisions, to evaluate programs, and to set priorities for future programs.
- 6. The Calculation TheQALY can be calculated using the following formula which assumes a utility value (quality of life) between 1 = perfect health and 0 = dead: Years of Life x Utility Value = #QALYs This means: If a person lives in perfect health for one year, that person will have 1 QALY. (1 Year of Life × 1 Utility Value = 1 QALY) If a person lives in perfect health but only for half a year, that person will have 0.5 QALYs. (0.5 Years of Life x 1 Utility Value = 0.5 QALYs) Conversely, if a person lives for 1 year in a situation with 0.5 utility (half of perfect health), that person will also have 0.5 QALYs. (1 Year of Life x 0.5 Utility Value = 0.5 QALYs)
- 7. Example Ifa person lives for 3 years with a disease and the current standard of care for that disease means he/she lives with a utility level of 0.7, that person will have 2.1 QALYs. (3 Years of Life x 0.7 Utility Value = 2.1 QALYs) If that person takes a new medicine (Med A) whereby his/her utility level increases to 0.9, that person will now have 2.7 QALYS. Therefore, the benefit of the new medicine will be counted as 0.6 QALYs as this is the increase over the current standard of care. (3 Years of Life x 0.2 Additional Utility Level = 0.6 QALYs) Similarly, if a new medicine (Med B) prolongs the patient’s life by 2 years, at a utility level of 0.7, the new medicine will provide the person with 1.4 additional QALYs. (2 Years of Additional Life x 0.7 Utility Value = 1.4 QALYs)
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- 13. References wikipedia.org/wiki/Quality-adjusted_life_year#:~:text=The%20quality- adjusted%20life%20year,one%20year%20in%20perfect%20health. https://www.celforpharma.com/insight/do-you-know-what-qaly-and-how- calculate- it#:~:text=QALY%20stands%20for%20Quality%20Adjusted,help%20payers%20allo cate%20healthcare%20resources. Problems and solutions in calculating quality-adjusted life years (QALYs)