Years Lived with Disability

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Glossary

and Development (IBRD) and the International Development Association (IDA). The World Bank supported together with the World Health Organization the first Global Burden of Disease study.

World Health Organization Definition The World Health Organization (WHO) is a specialized agency of the United Nations (UN) that acts as a coordinating authority on international public health. Established on April 7, 1948 and headquartered in Geneva, Switzerland, the agency inherited the mandate and resources of its predecessor, the Health Organization, which had been an agency of the League of Nations.

World Health Organization Disability Assessment Schedule II Definition WHODAS II assesses day-to-day functioning in six activity domains. Results provide a profile of functioning across the domains as well as an overall disability score.

World Health Organization Quality of Life BREF Definition The WHOQOL-BREF was developed to evaluate QOL and contains 26 items divided into four domains: physical, psychological, social relationships and environmental (WHO 1996).

World Health Organization Quality of Life Questionnaire Definition A QOL questionnaire developed by the WHO, comprised of four domains: physical health, psychological health, social relationships, and environmental and global assessment of QOL. The questionnaire has been translated in many languages and is increasingly used in QOL studies.

World Health Organization Regions Definition The WHO divides the countries of the world among its regional offices. Within each region defined by a regional office, the countries are further stratified by levels of mortality (A – lowest mortality through E – highest mortality).

WTP ▶ Willingness-to-Pay

Xerostomia Definition Reduced salivary flow.

Years Lived with Disability Definition The Years Lived with Disability are the number of years that a subject lives with some disease. It depends on the severity of the

Glossary

disability that the disease causes to the affected individual. Chronic disease disables an individual once disease is diagnosed, and the years that he or she lives until death are the number of years lived with disability.

Years of Healthy Life Definition A measure developed in response to the need to monitor changes in the healthy life span as set forth in Healthy People 2000. The construct was developed using measures collected in the National Health Interview Survey and is based on two measures: perceived health status and activity limitation.

Years of Life Lost Age-Standardized Rate Synonyms Age-Adjusted Years Life Lost Rate; AgeAdjusted Rate of Years of Life Lost Definition Years of Life Lost (YLL) Age-Standardized Rate is the amount of years of life lost per population member of a standard population. Since most diseases are related to age, applying YLL rates (by age category) to a standard population minimizes the effects of the sometimes drastically different age compositions of populations to allow for proper comparisons. Often age-standardized YLL rates will be multiplied by a factor of 10