Clinical Research Glossary

cohort cohort


A group of study participants that are similar in some way.

Example of cohort in a sentence

Data were collected from a cohort of people over the age of 65 to see if the participants developed health problems.

More Info

A cohort is usually a group of people who are in an observational study to see how a disease or condition develops. A cohort is also the group of people in a clinical trial testing a study treatment for a specific disease or condition.

Other info to think about when joining a study

You may hear the term “cohort” when the study team is describing the research study to you or when you are reading the study consent form. This term may come up when learning about the study groups and the different study treatments they may take or what different groups of participants may have to do differently.

It can be helpful to ask why a specific cohort was selected for the study you are joining and what the researchers would like to learn.

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