Prevalence rate
Prevalence Rate
Prevalence rate (pronunciation: /ˈprɛvələns reɪt/) is a statistical concept widely used in epidemiology to measure the proportion of individuals in a population who have a particular disease or condition at a specific point in time or over a specified period.
Etymology
The term "prevalence" is derived from the Latin word "praevālēre", which means "to be powerful". The term "rate" comes from the Latin word "rata", which means "fixed portion". In the context of epidemiology, the prevalence rate is a measure of the proportion of a population that is affected by a specific disease or condition.
Definition
The prevalence rate is calculated by dividing the number of existing cases of a disease or condition by the total population, and then multiplying the result by a standard factor (usually 1,000 or 100,000) to make the number easier to understand and compare. It is usually expressed as a percentage or a rate per 1,000 or 100,000 individuals.
Related Terms
- Incidence rate: This is a measure of the number of new cases of a disease or condition in a population over a specific period. It is different from the prevalence rate, which includes both new and existing cases.
- Morbidity rate: This is a measure of the number of individuals in a population who become ill or are affected by a disease or condition over a specific period.
- Mortality rate: This is a measure of the number of deaths in a population over a specific period. It is often used in conjunction with the prevalence rate to understand the impact of a disease or condition on a population.
See Also
External links
- Medical encyclopedia article on Prevalence rate
- Wikipedia's article - Prevalence rate
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