Principles Of Public Health Exam 1

Incidence vs. prevalence – which statement is correct?

Incidence rate captures new cases over time, while prevalence rate captures all existing cases at a point or period Incidence rate captures all existing cases, while prevalence rate captures only new cases Both rates capture only new cases Both rates capture only existing cases

Correct Answer:

Incidence rate captures all existing cases, while prevalence rate captures only new cases

Explanation:

Understanding the difference between incidence and prevalence starts with what each measure counts. Incidence looks at new cases that appear in a population during a defined time period, giving a sense of the rate at which people are developing the condition. Prevalence, on the other hand, counts all existing cases—both new and pre-existing—at a specific point in time (point prevalence) or over a defined period (period prevalence). So the correct statement is that incidence measures new cases over time, while prevalence measures all existing cases at a point or over a period. The other descriptions mix up what each rate counts—for example, incidence is not about all existing cases, and prevalence is not limited to only new cases.

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