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11-SEPTEMBER-2008 12:20:15 - Prevalence Contents 1 Definition 2 Examples and Utility 3 See also 4 External links Definition In epidemiology, the prevalence of a disease in a statistical population is defined as the total number of cases of the disease in the population at a given time, or the total number of cases in the population, divided by the number of individuals in the population. It is used as an estimate of how common a condition is within a population over a certain period of time. It helps physicians or other health professionals understand the probability of certain diagnoses and is routinely used by epidemiologists, health care providers, government agencies, and insurance companies. Mathematically prevalence can be defined as follows let a = the number of individuals in the population with the disease at a given time let b = the number of individuals in the population without the disease at a given time Prevalence = \fracaa + b Examples and Utility For example, the prevalence of obesity among American adults in 2001 was estimated by the U. S. Centers for Disease Control CDC at approximately 20.9%. In plain English, prevalence simply means extent, but in scientific English it means proportion typically expressed as a percentage. Prevalence is distinct from incidence. Prevalence is a measurement of all individuals affected by the disease within a particular period of time, whereas incidence is a measurement of the number of new individuals who contract a disease during a particular period of time. To illustrate, a long term disease that was spread widely in a community in 2002 will have a high prevalence at a given point of 2003 assuming it has a long duration but it might have a low incidence rate during 2003 i.e. lots of existing cases, but not many new ones in that year. Conversely, a disease that is easily transmitted but has a short duration might spread widely during 2002 but is likely to have a low prevalence at any given point in 2003 due to its short duration but a high incidence during 2003 as many people develop the disease. As such, prevalence is a useful parameter when talking about long lasting diseases, such as HIV, but incidence is more useful when talking about diseases of short duration, such as chickenpox. Lifetime prevalence LTP is the number of individuals in a statistical population that at some point in their life up to the time of assessment have experienced a case e.g., a disorder, compared to the total number of individuals i.e. it is expressed as a ratio or percentage. Often, a 12-month prevalence or some other type of period prevalence is used in conjunction with lifetime prevalence. There is also point prevalence, the prevalence of disorder at a more specific a month or less point in time. There is also a related figure lifetime morbid risk - the theoretical prevalence at any point in life for anyone, regardless of time of assessment. example: Synopsis of article on How Prevalent Is Schizophrenia? from Public Library of Science See also Look up prevalence in Wiktionary, the free dictionary. Incidence Rare disease External links PlusNews, the UN's HIV/AIDS news service provides HIV prevalence rates for nearly 60 countries worldwide Retrieved from http://en..org/wiki/Prevalence Categories: Epidemiology Views Article Discussion this page History Personal tools Log in / create account Navigation Main page Contents Featured content Current events Random article Search Go Search Interaction Community portal Recent changes Contact Donate to Help Toolbox What links here Related changes Upload file Special pages Printable version Permanent link Cite this page Languages Català Deutsch Español Français Italiano Lietuvių Nederlands 日本語 ‪Norsk bokmÃ¥l‬ Polski РуÑ?Ñ?кий Simple English SlovenÄ?ina Svenska This page was last modified on 25 August 2008, at 02:1
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