A study that compares large groups of people instead of individuals for differences in things such as cancer rates. The groups can differ by location (for example, city, county, or country). They can also differ by time (a few days, years, or decades). Groups can be immigrants (compared with people who are native to the country) or people with diff...
Found on
http://www.cancer.gov/dictionary?expand=E
Type: Term Definitions: 1. epidemiologic study in which the units of analysis are populations or groups of people rather than individual people.
Found on
http://www.medilexicon.com/medicaldictionary.php?t=85722
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