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Immigrants in areas of low immigrant density have a greater incidence of psychotic disorders than native Dutch

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Dr W Veling

Correspondence to: Dr W Veling, Parnassia Psychiatric Institute, Mangostraat 15, 2552 KS, The Hague, The Netherlands; w.veling@parnassia.nl

QUESTION

Question:

Does the incidence of schizophrenia in immigrants vary depending on the ethnic density of their neighbourhoods?

Population:

The general population of The Hague (472 087 people as of 1 January 2005).

Setting:

The Hague, The Netherlands; April 1997 to April 1999 and October 2000 to October 2005.

Assessment:

During the 7-year study period, all people in The Hague presenting for the first time to physicians with suspected psychotic disorder were referred for DSM-IV diagnoses. Diagnoses were based on patient assessment (Comprehensive Assessment of Symptoms and History interview), information from relatives (Instrument for Retrospective Assessment of the Onset of Schizophrenia), and/or clinical information from the patient’s physician (this was the sole source of information on 23% of participants). Consensus diagnoses were made by two psychiatrists. Information was collected on the patient’s ethnicity (native Dutch or first or second generation immigrant). The major non-native Dutch ethnic groups were Moroccan, Surinamese and Turkish. Other ethnic groups were not included in …

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