A researcher compares the history of caffeine intake in men who do and do not have prostate cancer. This is an example of what type of study?

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In a retrospective study, subjects are asked about prior exposure to the independent variable. In a panel study, data are collected from the same individuals over a prolonged period of time. In a prospective study, individuals with a risk factor (independent variable) are followed forward in time to see if they develop the dependent variable.

A Researcher Compares the History of Caffeine Intake in Men