A screening for diabetes revealed 20 previously diagnosed diabetics and 10 probable new cases, which were later confirmed, for a total of 30 cases. Which of the following best describes what is being measured?
a. Prevalence
b. Incidence
c. Attack rate
d. Morbidity rate
ANS: A
Prevalence is the measure of existing disease in a population at a particular time. Incidence quan-tifies the rate of development of new cases in a population at risk, whereas an incidence propor-tion indicates the proportion of the population at risk who experience the event over some period of time. Attack rate is defined as the proportion of persons who are exposed to an agent and de-velop the disease. Morbidity rate is the incidence of disease.
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