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A cohort study is an observational study in which a population of individuals are followed over a period of time to determine outcomes related to a particular exposure. It is often used to study the effects of long-term exposures such as a particular lifestyle habits or exposures to environmental toxins. With cohort studies, data is collected on a group of individuals at the start of the study, and then tracked over time to observe any changes or trends. This type of study has the advantage of being able to provide a more accurate picture of the impact of certain exposures, as it can control for certain variables that may affect outcomes, like age and gender. Cohort studies are also generally less expensive and less time-consuming than randomized controlled trials.
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