[The incidence of psychotic disorders among migrants in the Netherlands: findings from the multinational EU-GEI study.] / Incidentie van psychose onder migranten in Nederland.

OBJECTIVE: To compare the incidence of psychosis among migrants with the incidence among the native Dutch in Amsterdam, Gouda and Voorhout. DESIGN: We identified patients with a first treated episode of psychosis (ICD-10 codes F20-F33) in 2010-2013 as part of the European Network of National Schizophrenia Networks Studying Gene-Environment Interactions (EU-GEI) study. Information on the composition of the population made it possible to calculate incidence rates. METHOD: We analyzed the Incidence Rate Ratios (IRR) of psychosis among various ethnic groups compared to the native Dutch using a Poisson model. RESULTS: The standardized rates in Amsterdam were 55.3/ 100,000 person-years (py) for migrants and 24.9/ 100,000py for native Dutch. In Gouda and Voorhout, these rates were 28.5 en 20.0/ 100,000py. We found increased rates among Moroccan males of the first (IRR=4.07 [95%-CI: 1.76-9.42]) and second generation (IRR=6.48 [3.30-12.68]) in Amsterdam. In Gouda and Voorhout, we found increased rates both among Moroccan males (IRR=3.37 [1.17-9.74]) of the first generation and Moroccan females of the second generation (IRR=7.10 [2.79-18.06]). High rates were also found in Amsterdam for male migrants from Eastern Europe (IRR=4.52 [2.24-9.11]), migrants from sub-Saharan Africa (IRR=3.15 [1.68-5.91]) and first-generation migrants, both males and females, from Surinam and the Netherlands Antilles. We found a decreased incidence for Western migrants. CONCLUSION: We found an increased incidence of psychosis among non-Western migrants and in Amsterdam also among Eastern-European migrants. The variation by region of origin and destination generation, and gender suggests that this risk is strongly influenced by the societal context.

Gender differences of patients at-risk for psychosis regarding symptomatology, drug use, comorbidity and functioning - Results from the EU-GEI study.

BACKGROUND: Gender differences in symptomatology in chronic schizophrenia and first episode psychosis patients have often been reported. However, little is known about gender differences in those at risk of psychotic disorders. This study investigated gender differences in symptomatology, drug use, comorbidity (i.e. substance use, affective and anxiety disorders) and global functioning in patients with an at-risk mental state (ARMS) for psychosis. METHODS: The sample consisted of 336 ARMS patients (159 women) from the prodromal work package of the EUropean network of national schizophrenia networks studying Gene-Environment Interactions (EU-GEI; 11 centers). Clinical symptoms, drug use, comorbidity and functioning were assessed at first presentation to an early detection center using structured interviews. RESULTS: In unadjusted analyses, men were found to have significantly higher rates of negative symptoms and current cannabis use while women showed higher rates of general psychopathology and more often displayed comorbid affective and anxiety disorders. No gender differences were found for global functioning. The results generally did not change when corrected for possible cofounders (e.g. cannabis use). However, most differences did not withstand correction for multiple testing. CONCLUSIONS: Findings indicate that gender differences in symptomatology and comorbidity in ARMS are similar to those seen in overt psychosis and in healthy controls. However, observed differences are small and would only be reliably detected in studies with high statistical power. Moreover, such small effects would likely not be clinically meaningful.

Associations between stereotype awareness, childhood trauma and psychopathology: a study in people with psychosis, their siblings and controls.

INTRODUCTION: Stereotype awareness--or an individual's perception of the degree to which negative beliefs or stereotypes are held by the public--is an important factor mediating public stigma, self-stigma and their negative consequences. Research is required to assess how individuals become more sensitive to perceive stereotypes, pointing the way to therapeutic options to reduce its negative effects and increase stigma resilience. Because perception and interpretation can be guided by belief systems, and childhood trauma (CT) is reported to impact such beliefs, CT is explored in relation to stereotype awareness (SA) in persons with psychosis, their siblings and controls. METHOD: Data from the GROUP project (Genetic Risk and Outcome of Psychosis) were analyzed. SA was measured by devaluation scales which assess a respondent's perception of the degree to which stereotypes about people with mental illness and about their families are held by the public. CT was measured using the Childhood Trauma Questionnaire (short form). RESULTS: In patients, symptoms of disorganization and emotional distress were associated with SA about people with mental illness. In siblings, schizotypal features were associated with both types of SA (more schizotypy = more SA). In both patients and siblings, CT was associated with both types of SA (more CT = more SA), independent of symptoms (patients) or schizotypy (siblings). CONCLUSION: CT in people with psychosis and their siblings may sensitize to SA. Thus, CT may not only impact on risk for illness onset, it may also increase SA associated with mental illness, potentially interfering with the recovery process. CT-induced SA may indicate a heightened sensitivity to threat, which may also impact psychopathology.

Childhood trauma and clinical outcome in patients at ultra-high risk of transition to psychosis.

BACKGROUND: Although transition rates in 'ultra-high risk' (UHR) for psychosis samples are declining, many young individuals at UHR still experience attenuated positive symptoms and impaired functioning at follow-up. The present study examined the association between a history of childhood trauma and transition to psychosis, and symptomatic and functional outcome, in UHR patients. METHOD: Data on childhood trauma were available for 125 UHR individuals. Cox regression and linear regression analyses were used to determine the association between childhood trauma, and clinical and functional outcome, during the 24-month follow-up. RESULTS: Of the 125 UHR subjects 26 individuals (20.8%) transitioned to psychosis within 24 months. Childhood trauma did not predict transition to psychosis. However, at 24-month follow-up, UHR patients with higher levels of childhood trauma had higher levels of attenuated positive symptoms (b = 0.34, t = 2.925, p < 0.01), general symptoms (b = 0.29, t = 2.707, p < 0.01) and depression (b = 0.32, t = 2.929, p < 0.01) and lower levels of global functioning (b = − 0.33, t = − 2.853, p = 0.01). Childhood trauma was not significantly associated with a differential course of symptoms over time, although in those with higher levels of childhood trauma, attenuated positive symptoms were more persistent at a trend level. CONCLUSIONS: Our results suggest that childhood trauma may contribute to a shared vulnerability for several psychopathological domains.