Longitudinal epidemiological studies that begin with people who are disease-free and who then are followed for a period of years are called:

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Longitudinal epidemiological studies that begin with people who are disease-free and who then are followed for a period of years are called prospective studies. These studies aim to identify risk factors or causes for a specific disease by following individuals over time and observing any changes in their health status. Retrospective studies, on the other hand, start with individuals who already have the disease and then look back at their past exposures or risk factors. Correlational studies explore the relationship between two or more variables, while cross-sectional studies collect data on a specific population at a specific point in time.

Longitudinal Epidemiological Studies That Begin with People Who Are Disease-Free