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. 2009 Sep 16;118(1):87–91. doi: 10.1289/ehp.0900818

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Subject-specific effect estimates (percent changes with 95% CIs) for 5-min HRV indices associated with an IQR (69.5 μg/m³) increase in the 30-min PM_2.5 moving average. The x-axis indicates different subjects (subjects 1–6 are females; subjects 7–11 are males).