Risk of psychosis among migrants to the Netherlands by time since arrival.

BACKGROUND

The high risk of psychosis among migrants is often attributed to social stressors in the host country. We examined whether the relative risk of psychosis among migrants is low on arrival and increases thereafter.

METHODS

In this cohort study, first-generation immigrants to the Netherlands, aged 10 years and older (

RESULTS

The IRR of APM was 0.22 (95% CI 0.21-0.24) in the year of arrival ('year 1') and increased gradually to 1.39 (1.19-1.62) after 10 or more years. The IRR of an insurance claim increased from 0.57 (0.51-0.62) to 1.87 (1.38-2.55) in year 5. Among migrants from sub-Saharan Africa, the IRR of an insurance claim was already high in year 1 [2.46 (1.95-3.11)], especially when aged 10-20 years at arrival [6.09 (2.93-12.64)]. Among migrants from other non-Western countries, the IRR was already significantly increased in year 2 [1.28 (1.03-1.59)].

CONCLUSIONS

The relative risk of psychosis among migrants was generally low at arrival and increased thereafter. The increased IRRs in the early years after arrival among those from non-Western countries indicate that for these groups certain risk factors are already relevant shortly after arrival.