An epidemiological study which follows a group of people over time is a cohort study.
An epidemiological research known as a cohort examines a group of people who share a common trait across time to determine how many of them experience a particular health outcome of interest, such as an illness, condition, incident, death, or change in health status or behavior.
A cohort is described as a group of individuals, typically 100 or more in number, who share a common trait, such as smoking, working in a lead smelter, being born in the same year, or being enrolled in the same health insurance plan. In order to ascertain if the outcome of interest is related to exposure, cohort studies compare an exposed group of people to a less exposed (or unexposed) group of people.
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