Example: The Epidemiological Catchment Area Project
In an attempt to measure the prevalence of mental illness in the United States, Lee Robins and Darrel A. Regier conducted a study called the Epidemiological Catchment Area Project which surveyed samples of the general population at five sites across America. In the study, it was found that about a third of all Americans suffer from mental illness at some point in their lives. This statistic is often referred to as lifetime prevalence.
Dissociative disorders were excluded from the Project, as these diagnoses were considered extremely rare, lacked standardized criteria and did not have a validated diagnostic instrument.
Read more about this topic: Psychiatric Epidemiology
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