# Is prevalence a measure of risk?

**measure**of the

**risk**of disease or the probability of developing the disease during the specified period. As a

**measure**of incidence, it includes only new cases of disease in the numerator. The denominator is the number of persons in the population at the start of the observation period.

Regarding this, how is prevalence measured?

To estimate **prevalence**, researchers randomly select a sample (smaller group) from the entire population they want to describe. For a representative sample, **prevalence** is the number of people in the sample with the characteristic of interest, divided by the total number of people in the sample.

Secondly, what is the difference between prevalence and incidence? The easy way to remember the **difference** is that **prevalence** 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.

Correspondingly, is prevalence a measure of association?

Comparing Risk Among Two or More Exposure Groups. In a previous module we saw that we can **measure** disease frequency (cumulative incidence, incidence rate, or **prevalence**) by identifying the number of cases in the numerator and the population (people or person-time) in the denominator.

What is disease prevalence?

**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, whereas incidence refers to the number of new cases that develop in a given period of time.