Quality-Adjusted Life Year: Difference between revisions
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== Calculation of QALY == | == Calculation of QALY == | ||
To calculate the QALY, the following formula can be used; this assumes a utility value (quality of life) between 1 = perfect health and 0 = dead. | To calculate the QALY, the following formula can be used; this assumes a utility value (quality of life) between 1 = perfect health and 0 = dead. | ||
This results in the following: | |||
1. If an individual has perfect health for a perioe of 1 year, they will be said to have 1 QALY. | |||
ie. 1 YEar of Life x 1 Utility Value = 1 QALY | |||
2. If an individual lives in perfect health but only for half a year, that individual will have 0.5 WALY. | |||
ie. 0.5 Years of Life x 1 Utility Value = 0.5 QALY | |||
3. If an inidividual lives for 1 year in a situation with 0.5 utility (half of perfect health) that individual will have 0.5 QALY | |||
ie. 1 Year of Life x 0.5 Utility Value = 0.5 QALY | |||
== Function/Uses of QALYs == | == Function/Uses of QALYs == | ||
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Introduction & Definition[edit | edit source]
The Quality-Adjusted Life Year (QALY) is a measure of the value and benefit of health outcomes.
Health is definied as a function of two components:
1. length of life
2. quality of life
The QALY is an attempt to combine these two attributes into a single figure/number[1].
Calculation of QALY[edit | edit source]
To calculate the QALY, the following formula can be used; this assumes a utility value (quality of life) between 1 = perfect health and 0 = dead.
This results in the following:
1. If an individual has perfect health for a perioe of 1 year, they will be said to have 1 QALY.
ie. 1 YEar of Life x 1 Utility Value = 1 QALY
2. If an individual lives in perfect health but only for half a year, that individual will have 0.5 WALY.
ie. 0.5 Years of Life x 1 Utility Value = 0.5 QALY
3. If an inidividual lives for 1 year in a situation with 0.5 utility (half of perfect health) that individual will have 0.5 QALY
ie. 1 Year of Life x 0.5 Utility Value = 0.5 QALY
Function/Uses of QALYs[edit | edit source]
Limitations of QALYs[edit | edit source]
Recent Related Research (from Pubmed)[edit | edit source]
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References[edit | edit source]
References will automatically be added here, see adding references tutorial.
- ↑ Pliskin JS, Shepard DS, Weinstein MC. Utility functions for life years and health status. Operations Research 1980;28:206-24
