Incidence of psychotic disorders in immigrant groups to The Netherlands.
BACKGROUND
Previous reports on the incidence of schizophrenia in immigrant groups to The Netherlands were based on hospital data.


OBJECTIVE
To compare the incidence of psychotic disorders in the immigrant groups to that in natives.


METHODS
Two-year first-contact incidence study in The Hague.


RESULTS
The risks of schizophrenia, schizophreniform or schizoaffective disorder (DSM-IV criteria) were increased for subjects born in Morocco (gender and age-adjusted relative risk=4.5; 95% Cl 1.4-8.5), Surinam (relative risk=3.2; 1.8-5.7), The Netherlands Antilles (relative risk=2.9; 0.9-9.5) and other non-Western countries (relative risk=2.4; 1.3-4.7). This risk was also increased for Moroccans (relative risk=8.0; 2.6-24.5) and Surinamese (relative risk=5.5; 2.5-11.9) of the second generation. The risks for Turkish immigrants, first or second generation, and for immigrants from Western countries were not significantly increased.


CONCLUSIONS
This study indicates that the incidence of schizophrenia is increased in several, but not all, immigrant groups to The Netherlands. It is possible that factors associated with a process of rapid westernisation precipitate schizophrenia in people who are genetically at risk.
Selten
J P
JP
Department of Psychiatry, University Medical Centre, PO Box 85500, 3508 GA Utrecht, The Netherlands. j.p.selten@psych.azu.nl
Veen
N
N
Feller
W
W
Blom
J D
JD
Schols
D
D
Camoenië
W
W
Oolders
J
J
van der Velden
M
M
Hoek
H W
HW
Rivero
V M
VM
van der Graaf
Y
Y
Kahn
R
R
D000328:Adult; D004641:Emigration and Immigration; D005260:Female; D006801:Humans; D015994:Incidence; D008297:Male; D009426:Netherlands / Q000453:epidemiology; D011618:Psychotic Disorders / Q000208:ethnology*; D018570:Risk Assessment; D012559:Schizophrenia / Q000208:ethnology; D012923:Social Class; D014171:Transients and Migrants / Q000523:psychology*