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. 2014 Mar 14;122(6):609–615. doi: 10.1289/ehp.1307277

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PM_2.5 concentration–response curve (solid red line) and 95% CI (blue dashed lines) for cardiovascular mortality in men based on natural spline models with 2 degrees of freedom. The Cox model was stratified by state of enrollment and birth year category and adjusted for BMI (kg/m²), pack-years of smoking, marital status, education, alcohol consumption, and vegetable consumption.