It's calculated simply like this:
Number of People who develop disease in one year / average number of people in the population in the same year
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prevalencerefers to the number of cases of disease thatexistsin a population and the incidence refers to the number of new cases of diseaseoccurringin a population.
# of new cases of a specified disease in a population / population at risk for getting the disease
=incidence
Incidence rates vary between 25 and 50 per 100,000 persons.
The noun 'incidence' has many synonyms. A few of them are: frequency, percentage, prevalence, proportion, tendency, commonness, trend and extent. The meaning of incidence is the rate or frequency of which something occurs.