This paper addresses the question of why there has been so little progress in The field of evaluation of health transition, and how can take into consideration the concept of Global Burden of Disease (GBD) to answer this question.
In order to capture the impact of both premature death and disability in a single measure, a common currency is required Since the late 1940s, researchers have generally agreed that time is an appropriate currency time (in years) lost through premature death, and time (in years) lived with a disability A range of such time- based measures has been developed in different countries, many of them variants so-called Quality-Adjusted Life Year or QALY For the Global Burden of Disease (GBD), an internationally standardized form of the QALY has been developed, called the Disability-Adjusted Life Year (DALY) The DALY expresses years of life lost to premature death and years lived with a disability of specified severity and duration One DALY is thus one lost year of healthy life. Here, a "premature" death is defined as one that occurs before the age to which the dying person could have expected to survive if he was a member of a standardized model population with a life expectancy at birth equal to that of the world's longest-surviving population in Japan. In addition to DALY, the GBD project developed another summary measure, the Disability- Adjusted Life Expectancy (DALE), to provide a comprehensive assessment of the global burden of disease and injury. Both these summary measures of population health (SMPH) combine information on the impact of premature death and of disability and other non-fatal health outcomes.
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