The proportion of a population living at a given time with a condition or disease (compared to the incidence rate, which refers to new cases).
The number of current cases of a condition or illness at one time, divided by the total number of people who may be at risk for the illness or condition. Example: Eight people in a community of 4,000 go to kidney dialysis, but only one began dialysis this year. The prevalence rate of chronic renal failure in that community is 8/4000 or 2 per 1000 persons.
The amount of a given disease or other condition in a given population at a designated point in time.
the total number of persons sick or portraying a certain condition in a stated population at a particular time or during a stated period of time, regardless of when that illness or condition began, divided by the population at risk of having the disease or condition at the point in time midway through the period in which they occurred.
Total number of people infected at one time in a population, regardless of when the disease began.
Rates that express in a given population the proportion of persons who have a particular disease or attribute at a specified point in time.
As used in this report, the proportion of youths involved in one or more violent behaviors during some specified time interval, for example, the past year, by age 18, or ever.
a measure of the total number of people (old and new cases) in a population who have a health problem at a specified point in time (usually used for chronic conditions like diabetes).
The number of cases of a specified disease in a given population at a designated time
a measure of morbidity based on current sickness in a population, estimated either at a particular time or over a stated period.
The proportion of persons in a population who have a particular disease or attribute at a specified point in time or over a specified period of time.
is the number of existing cases at a specific time/size of the population at risk. In a stable population, Prevalence = Incidence X Duration of Disease. In terms of prevalence rate, "crude" is the total members at or during a given time; "specific" is the prevalence rate divided by categories (age-specific, disease-specific, mortality); "adjusted rate" is the rate adjusted to a standard population based on characteristics which may influence the outcome, e.g. age-adjusted mortality.
The number of people in a defined population with a disease (or injury or other health-related condition) at a given point in time (point prevalence) or during a specified period (period prevalence), divided by the average population. Prevalence data hence show the magnitude of a given health problem and are important in planning services and allocating resources. As they however include persons who may have contracted the disease many years ago, they are not useful in aetiological (causal) studies.
Total number of individuals who have an attribute or disease at a particular time (or during a particular period) divided by the population at risk of having the attribute or disease at this point in time or midway through the period. Last, 1988 RT population at risk.
the number of cases of a disease existing in a given population at a specific point or period of time.
The number of people having a particular disease at a given point in time per 1,000 population at risk. Source: PRB
