Although there were some ethnic group differences in the specific rates of disorders, the overall conclusion from the epidemiological catchment area project (eca) was that:

The conclusion was there are very few differences in the rate of psychiatric disorders.

Explanation:

The Epidemiological Capture Area Project (ECA) was a research program done in 1977 that sought to study the incidence of mental disorders among ethnic groups and the degree of need for treatment for these disorders. At the end of this research the overall conclusion of the Epidemiological Capture Area Project (ACE) was that although there were some differences between ethnic groups in specific disorder rates, there are very few differences in the rate of psychiatric disorders.