Cohort study

A cohort study follows a group of people over time to see what happens to them. It watches; it doesn't assign treatment.

This term is specific to research interpretation and is defined on AnxietyResearch. Shrinktionary, the network's language layer, doesn't currently carry a canonical entry for it.

Researchers pick a group, the cohort, and track it forward in time. They compare people who had some exposure against people who didn't. Because no one is randomly assigned, a cohort study shows links, not proof of cause. It is an observational study, which means the researchers observe rather than control what happens.

Some questions can't be tested with a randomized trial, for practical or ethical reasons. You can't randomly assign people to a stressful job or a chronic illness. Cohort studies are how researchers study questions like whether anxiety in early adulthood links to other health problems years later.

A study follows 5,000 adults for ten years. It records who had an anxiety disorder at the start, then checks who later developed heart disease. It can report whether the two are linked.

A cohort study can't rule out other explanations. If the anxious people in the study also slept less or had less access to care, any of those could drive the result instead. Researchers adjust for such factors with statistics, but adjustment is never perfect. Treat a cohort finding as a strong hint, not a verdict.