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Cohort

A group used as part of a research study. The group is made up of people sharing a common characteristic (for example, pupils in the same school year).

Cohort study:
A study with two or more groups of people - cohorts - with similar characteristics. One group receives a treatment, is exposed to a risk factor or has a particular symptom and the other group does not. The study follows their progress over time and records what happens.

National Institute for Health and Clinical Excellence