Quality of life
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Measuring health-related quality of life (HRQoL)
The measures often used in the study of health care are 'quality-adjusted life years' (QALYs) and the related 'disability-adjusted life years' (DALYs); both equal 1 for each year of full-health life, and less than 1 for various degrees of illness or disability. Thus the cost-effectiveness of a treatment can be assessed by the cost per QALY or DALY it produces; for example, a cancer treatment which costs $1 million and on average gives the patient 2 extra years of full health costs $500,000 per QALY. Assessing treatments in this way avoids the much greater problems associated with putting a monetary value on life, as required in other areas of economics; saying that a treatment costs $5000 per QALY (i.e. per year of life) does not say or assume anything about the monetary value of a year of life or about the real quality of that life.
Another method of measuring quality of life is by subtracting the "standard of living", according to the technical definition of the term. For example, people in rural areas and small towns are generally reluctant to move to cities, even if it would mean a substantial increase in their standard of living. One can thus see that the quality of life of living in a rural area is of enough value to offset a higher standard of living. Similarly people must be paid more to accept jobs that will lower their quality of life. Night jobs or ones with extensive travel all pay more, and the difference in salaries can also give a measure of the value of quality of life.
There is a growing field of research concerned with developing, evaluating and applying quality of life measures within health related research (e.g. within randomised controlled trials), especially Health Services Research. Many of these focus on the measurement of health related quality of life (HRQoL), rather than a more global conceptualisation of quality of life. They also focus on measuring HRQoL from the perspective of the patient and thus take the form of self completed questionnaires. The International Society for Quality of Life was founded in response to this research and is a useful source of information on this topic.
A number of groups and agencies around the world have tried to develop ways of assessing quality of life - See the External Links and See Also sections of this page.
Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
