How is ethnicity related to schizophrenia? 

Some ethnic groups may show more or less risk for schizophrenia than other ethnic groups. Incidence refers to how many new cases there are per population in a specified time period, while prevalence refers to how many existing cases there are at a particular point in time. Differences in the incidence and prevalence across various ethnic groups can provide clues to possible causes of schizophrenia.

What is the evidence for ethnicity?

Moderate to high quality evidence suggests the incidence of any psychotic disorder is greater in ethnic minority groups living in the UK or the Netherlands than in the majority population in those areas. The incidence of psychotic disorders in ethnic minority groups was found to be higher in areas with low ethnic density than in areas with high ethnic density. There was also a small increase in the prevalence and incidence of subclinical psychotic symptoms in people from ethnic minority groups.

For schizophrenia in particular, there is a large increased risk in black Caribbean and black African migrants living in the UK, and also in their descendants; and a medium-sized increased risk for Asian migrants compared to the white British population. In the USA, moderate quality evidence found a medium-sized increased risk of schizophrenia in Black people compared to White people. This effect was largest in studies with more males, more White participants, more young participants, in studies conducted in hospital and military settings, and in studies conducted in the Midwest, Southeast or national/multistate USA settings.

August 2020

Last updated at: 12:42 am, 26th August 2020
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