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

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Smoothed curve showing percentage deviation from mean predicted 5-min SDNN according to the 30-min PM_2.5 moving average (based on the model with all other covariates adjusted). The 30-min PM_2.5 moving average of the turning point for opposite association is 49.3 μg/m³.