Retrospective studies begin with a group of people who already have a disease or disorder.

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Retrospective studies are observational studies that look back in time at pre-existing data. This data can come from medical records, surveys, or other sources. Generally, these studies focus on a specific group of people who already have a particular disease or disorder, and researchers try to determine what factors may have contributed to the development of the condition.

Retrospective Studies Begin with a Group of People Who Already