Point prevalence: Difference between revisions
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In [[epidemiology]], '''point prevalence''' is a measure of the proportion of people in a population who have a disease or condition at a particular time, such as a particular date. It is like a snap shot of the disease in time. This is in contrast to [[period prevalence]] which is a measure of the proportion of people in a population who have a disease or condition over a specific period of time, say a season, or a year. | In [[epidemiology]], '''point prevalence''' is a measure of the proportion of people in a population who have a disease or condition at a particular time, such as a particular date. It is like a snap shot of the disease in time. It can be used for statistics on the occurence of [[chronic diseases]]. This is in contrast to [[period prevalence]] which is a measure of the proportion of people in a population who have a disease or condition over a specific period of time, say a season, or a year. | ||
Point prevalence can be described by the formula: | Point prevalence can be described by the formula: | ||
Revision as of 12:54, 24 February 2009
In epidemiology, point prevalence is a measure of the proportion of people in a population who have a disease or condition at a particular time, such as a particular date. It is like a snap shot of the disease in time. It can be used for statistics on the occurence of chronic diseases. This is in contrast to period prevalence which is a measure of the proportion of people in a population who have a disease or condition over a specific period of time, say a season, or a year.
Point prevalence can be described by the formula:
Prevalence = Number of existing cases on a specific date ÷ Number of people in the population on this date
References
Gerstman, B.B. (2003). Epidemiology Kept Simple: An Introduction to Traditional and Modern Epidemiology (2nd ed.). Hoboken, NJ: Wiley-Liss.