The correct answer is
DIncidence is the number of new events arising within a specified time period. The word incidence usually denotes incidence rate.
Prevalence is the number of events in a population at a designated time. The word prevalence usually denotes point prevalence ratio.
Point prevalence is the number of persons with a disease or attribute at a point in time.
Period prevalence is the number of persons who have had the disease or attribute at any time over a specified period.
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