In the years thereafter, an increasing trend in the IRR was found to 1.39 [1.19–1.62] after 10 or more years.
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Risk of psychosis among migrants to the Netherlands by time since arrival.
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The sentences
After exclusion of controls with a DTC for psychosis in this year, the IRR of Treatment was already significantly higher than 1.00 in the year of arrival [IRR = 1.41 (1.27–1.56)] and there was no longer a clear trend in the years thereafter (online Supplementary Fig.