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Prevalence is a measurement of all individuals affected by the disease at a particular time, whereas incidence is a measurement of the number of new individuals who contract a disease during a particular period of time.
Incidence is usually more useful than prevalence in understanding the disease etiology: for example, if the incidence rate of a disease in a population increases, then there is a risk factor that promotes the incidence. For example, consider a disease that takes a long time to cure and was widespread in 2002 but dissipated in 2003.
Epidemiology is concerned with the incidence of disease in populations and does not address the question of the cause of an individual's disease. This question, sometimes referred to as specific causation, is beyond the domain of the science of epidemiology.
Global Health Statistics: A Compendium of Incidence, Prevalence and Mortality Estimates for Over 200 Conditions (GBD 1990 volume 2) 1990: 1996: Harvard School of Public Health [49] Global Burden of Disease: A comprehensive assessment of mortality and disability from diseases, injuries, and risk factors in 1990 and projected to 2020 (GBD 1990 ...
The report also detailed the prevalence of specific risk factors for heart disease. More than 72% of U.S. adults have "unhealthy weight," which is defined as a body mass index of at least 25, the ...
DALYs = number of people with the disease × duration of the disease (or loss of life expectancy in the case of mortality) × severity (varying from 0 for perfect health to 1 for death) Necessary data include prevalence data, exposure-response relationships, and weighting factors that give an indication of the severity of a certain disorder ...