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- W2984484754 abstract "Objective To determine risk factors for multiple sclerosis (MS) in immigrants and to compare MS risk in immigrants and long-term residents in Ontario, Canada. Methods We applied a validated algorithm to linked, population-based immigration and health claims data to identify incident cases of MS in immigrants and long-term residents between 1994 and 2016. We conducted 2 multivariable Cox proportional hazards regression analyses: 1 analysis limited to the immigrant cohort assessing potential risk factors for developing MS, and 1 analysis comparing MS risk between immigrants and matched long-term residents (1:3 match). Results We identified 2,304,302 immigrants for the immigrant-only analysis, of whom 1,526 (0.066%) developed MS. Risk was greatest in those <15 years old at landing (referent <15 years; 16–30 years: hazard ratio [HR] 0.73, 95% confidence interval [CI] 0.63–0.85; 31–45 years: HR 0.55, 95% CI 0.47–0.64). Immigrants from the Middle East (HR 1.22, 95% CI 1.06–1.40) were at greater MS risk than immigrants from Western nations; all other regions had lower risk ( p < 0.0001). The matched analysis included 2,207,751 immigrants and 6,362,169 long-term residents. Immigrants were less likely to develop MS than long-term residents ( p < 0.0001), although this lower risk was attenuated with longer residence in Canada. Conclusions MS incidence in immigrants to Ontario, Canada, varied widely by region of origin, with greatest risk seen in those from the Middle East. Longer residence in Canada was associated with increased risk, even with migration in adulthood, suggesting that environmental exposures into adulthood contribute to MS risk." @default.
- W2984484754 created "2019-11-22" @default.
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- W2984484754 date "2019-11-05" @default.
- W2984484754 modified "2023-10-18" @default.
- W2984484754 title "MS risk in immigrants in the McDonald era" @default.
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- W2984484754 doi "https://doi.org/10.1212/wnl.0000000000008611" @default.
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