Answer and explanation

Correct answer: A. The number of new cases in a period divided by the population at risk

  1. Step 1: Incidence measures new events. Step 2. It uses new cases over the population at risk. Answer: new cases per population at risk. Why not the others: The others define prevalence, lethality or positivity.

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What is incidence? | Revalida (Brazil Medical Diploma Revalidation Exam)