Incidence should not be confused with prevalence, which is the proportion of cases in the population at a given time rather than rate of occurrence of new cases. Thus, incidence conveys information about the risk of contracting the disease, whereas prevalence indicates how widespread the disease is.Incidences and prevalence are often reported with a population multiplier such “per m people” or “per m person-years.” To convert a rate or proportion to “per m people,” simply multiplying by m. For example, an incidence rate of 0.00877 per person-year = 0.008770 × 100,000 = 877 per 100,000 person-years.So prevalence and incidence are similar, but prevalence includes new and pre-existing cases whereas incidence includes new cases only. The key difference is in their numerators. The numerator of an incidence proportion or rate consists only of persons whose illness began during the specified interval.The prevalence and incidence of a disease are among the most fundamental measures in epidemiology. ... However, because prevalence is determined by not only the number of persons affected but also their survival, prevalence is a less useful measure in studies of etiology than incidence rates.The incidence rate is a measure of the frequency with which a disease or other incident occurs over a specified time period. ... When the denominator is the sum of the person-time of the at-risk population, it is also known as the incidence density rate or person-time incidence rate.
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Incidence should not be confused with prevalence, which is the proportion of cases in the population at a given time rather than rate of occurrence of new cases. Thus, incidence conveys information about the risk of contracting the disease, whereas prevalence indicates how widespread the disease is.Incidences and prevalence are often reported with a population multiplier such “per m people” or “per m person-years.” To convert a rate or proportion to “per m people,” simply multiplying by m. For example, an incidence rate of 0.00877 per person-year = 0.008770 × 100,000 = 877 per 100,000 person-years.So prevalence and incidence are similar, but prevalence includes new and pre-existing cases whereas incidence includes new cases only. The key difference is in their numerators. The numerator of an incidence proportion or rate consists only of persons whose illness began during the specified interval.The prevalence and incidence of a disease are among the most fundamental measures in epidemiology. ... However, because prevalence is determined by not only the number of persons affected but also their survival, prevalence is a less useful measure in studies of etiology than incidence rates.The incidence rate is a measure of the frequency with which a disease or other incident occurs over a specified time period. ... When the denominator is the sum of the person-time of the at-risk population, it is also known as the incidence density rate or person-time incidence rate.
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