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. 2008 Feb 22;116(5):631–636. doi: 10.1289/ehp.10757

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HRs for witnessed non-DOA OHCAs for a 10-μg/m³ increase in PM_2.5 exposure during the hour of the arrest. Abbreviations: PEA, pulseless electrical activity; Vfib, ventricular fibrillation. Results are shown for all subjects and for subjects grouped by sex, race, age, and presenting heart rhythm. Error bars indicate 95% CIs.