Definition: A scientific study that compares a group of people with disease (such as leukemia) to a similar group of people without that disease. This type of study compares the levels of exposure (radiation or chemical) each group had before appearance of the disease.
Glossary Definition - Case Control Trial
From The National Institute for Occupational Safety and Health, for About.com
Updated June 22, 2006
About.com Health's Disease and Condition content is reviewed by the Medical Review Board
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