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For the main analysis, subgroup analyses used a 2-pollutant analysis (with both PM 2.5 and ozone), based on the mean of daily exposure on the same day of death and 1 day prior (lag 01-day) as the exposure metric for PM 2.5, and controlled for natural splines of air and dew point temperatures (each with 3 df).Vertical lines indicate effects for the entire study population.

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