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. 2014 May 16;122(9):919–925. doi: 10.1289/ehp.1307301

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Association between PM_2.5 exposure and stroke incidence in the 11 cohorts under study: results of the effect modification analysis. Values are HRs and 95% CIs per 5-μg/m³ increases in PM_2.5. p-Values of effect modification (right) were calculated as heterogeneity tests among coefficients in different strata of the effect modifiers.