When conducting an event-based study, follow-up samples must be selected from similar groups, known as ______.
A) cohorts
B) anchors
C) divisions
D) troops

Name: When conducting an event-based study, follow-up samples must be selected from similar groups, known as ______. A) cohorts B) anchors C) divisions D) troops
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Cohorts are groups of subjects who share a defining characteristic, typically used in event-based studies to ensure that follow-up samples are comparable and to control for variables.

When Conducting an Event-Based Study, Follow-Up Samples Must Be Selected