The quality or condition of being prevalent; superior strength, force, or influence; general existence, reception, or practice; wide extension; as, the prevalence of virtue, of a fashion, or of a disease; the prevalence of a rumor.
Prevalence is the number of cases of a disease, infected persons, or persons with some other attribute present during a particular interval of time. It is often expressed as a rate (for example, the prevalence of diabetes per 1,000 persons during a year).
The number of current cases of a condition or illness at one time, no matter when it started. Usually used to describe conditions that last a long time, or are chronic. The word "prevalence" is often used to mean prevalence rate.
Represents new and pre-existing cases of a disease alive on a given date. Prevalence is a function of both the incidence of the disease and survival with the disease. Thus, the annual incidence of a disease in the United States may be 30,000/ total population per year (new cases that year) but the prevalence of that disease may be 200,000/total population per year (new cases plus preexisting cases from prior years).
The number of instances of a given disease or other condition in a given population at a designated time. If the period is not mentioned, the concept usually refers to the situation at a specified point in time, that is, point prevalence.
A measure of the burden of a health condition in a population; generally the number or proportion of cases of the health condition at a specified time point or period. Prevalence is affected by both the incidence and the duration of the health condition in a population.
Total number of persons in a given population with a disease or other health-related event during a specified period of time, usually expressed as a percentage. The prevalence of smoking in U.S adults is approximately 25%.
the frequency of a particular condition within a defined population at a designated time (e.g., 12.6 million Americans living with heart disease in 1999, or 36.4% of African American men aged 20–74 years found to have hypertension in a survey conducted in 1988–1994).
The frequency of the condition under consideration in the population. For example, we calculate the prevalence of disease by dividing the number of diseased individuals by the number of individuals in the population. Prevalence is the prior probability of a specific condition (or diagnosis), before any other information is available.
In epidemiology, this is the percentage of the population who at a particular time have the disease being studied. If you replace the topic by a media research measure, such as watching TV at a particular time, you immediately see the close link between epidemiological and media research measures. Just as the average audience to a station is the percentage reach times the average duration, the prevalence of a disease is its times the average duration.
The total number of cases of a disease in existence at any one time in a defined population, including old and new cases. A prevalence rate is the total number of cases of a disease existing in a population divided by the total population.
Number of people portraying a certain condition in a stated population at a particular time or period of time, regardless of when the illness or condition began, divided by the number of persons in the population.
A measure of the proportion of people in a population who have some attribute or disease at a given point in time or during a specified time period. Point prevalence is the number of cases at one point in time and period prevalenced is the number of cases over a specifed time period (includes both the new [incident] cases over the period and existing cases of disease at a point in time).
The total number of cases of a given disease in a specified population at a designated time. It is differentiated from INCIDENCE, which refers to the number of new cases in the population at a given time.
The proportion of individuals in a population having a disease. Prevalence is a statistical concept referring to the number of cases of a disease that are present in a particular population at a given time. See the entire definition of Prevalence
the number of people in a given population affected with a particular disease or condition at a given time. Prevalence can be thought of as a snapshot of all existing cases at a specified time. (Contrast with incidence.)
In epidemiology, the number of cases in a given population at a given time. Often confused with incidence, e.g. incidence might be 2 per 100,000 per year and prevalence 60 per 100,000 populations. The prevalence of MS in Ireland is at least 100 per 100,000 populations.
The percent of the population with a particular condition or characteristic. To calculate prevalence you need to sum the number of individuals with a certain condition/characteristic and divide by the number of people in the population of interest over a specified time. (from the BRFSS site http://www.cdc.gov/brfss)
Prevalence differs from incidence in that it does not convey information about risk. Prevalence is defined as the number of individuals with a certain disease in a population at a specified time divided by the number of individuals in the population at that time. (See Incidence)
in this case, a measure of the number of people with lupus in a certain place at a certain time. It is expressed as the number of people with lupus within a group of 100 000 people from the same area at the same time e.g. 28 people with lupus in every 100 000 people.
Black's medical dictionary, G Macpherson ed; 38th ed One of the main ways to measure the frequency of a disease in a particular population - it is the total number of cases that are present at any one time - covering both old and new cases.
In epidemiology, the number of existing cases of a disease present during a particular time period and in relation to the size of the population. Often expressed as a rate, e.g., the prevalence of diabetes per 1,000 persons per year.
Number of instances of existing cases of a given disease or other condition in a given population at a designated time; sometimes used to mean prevalence rate. When used without qualification, the term usually refers to the situation at a specified point in time (point prevalence). Last, 1988 RT incidence
The total number of individuals who have a disease at a given point in time. For example, the estimate that 4.5 million Americans currently have Alzheimer's disease is a prevalence statistic. Incidence is the number of new cases expected to occur over the course of a year or some other limited period.
The prevalence of Autism is approximately 1 per 2000 people, the prevalence of Autism and Asperger's together is 1 per 1000 people. Although it is not known why, boys are affected more than girls. For Autism the sex ratio is four males to one female, for Asperger's syndrome, the ratio is nine males to one female.
The measure of how often the collection of items in an association occur together as a percentage of all the transactions. For example, "In 2% of the purchases at the hardware store, both a pick and a shovel were bought."