Which type of epidemiological study do researchers use when they want to estimate the percent of people who first show symptoms of a disease?

Question

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Incidence studies are used when researchers want to estimate the number of new cases of a disease or condition over a specified period of time. This would include estimating the percentage of people who first show symptoms of a disease. Prevalence studies, on the other hand, estimate the total number of cases of a disease or condition in a population at a given point in time, and descriptive studies simply describe the characteristics of a specific population or situation. Multivariate studies involve analyzing the relationship between multiple variables and outcomes.

Which Type of Epidemiological Study Do Researchers Use When They