The prevalence can be calculated from the ratio of the number of affected individuals of a population and the number of all the individuals of this population:
When you only look at the number of newly affected persons, you talk about the incidence.
After the period that the prevalence refers to, you can further differentiate between:
The comparison of the point prevalence at different points of time is better suited for the assessment of the epidemiological dynamics of a disease than the period prevalence.
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