• (cohort) A study in which subjects are grouped based on a predefined personal or administrative characteristic.
  CDISC Terminology
  Clinical Data Interchange Standards Consortium (CDISC), 2021
• (cohort study) A research study that compares a particular outcome (such as lung cancer) in groups of individuals who are alike in many ways but differ by a certain characteristic (for example, female nurses who smoke compared with those who do not smoke).
  NCI
  U.S. National Cancer Institute, 2021
• (cohort study) Study of a group of individuals, some of whom are exposed to a variable of interest, in which subjects are followed over time. Cohort studies can be prospective or retrospective.
  CDISC Terminology
  Clinical Data Interchange Standards Consortium (CDISC), 2021
• Studies in which subsets of a defined population are identified. These groups may or may not be exposed to factors hypothesized to influence the probability of the occurrence of a particular disease or other outcome. Cohorts are defined populations which, as a whole, are followed in an attempt to determine distinguishing subgroup characteristics.
  NLM Medical Subject Headings
  U.S. National Library of Medicine, 2025