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Temporal trends in prehospital coronary heart disease (CHD) death rates. CHD mortality rates partitioned into myocardial infarction and other coronary heart disease diagnoses in Olmsted County, Minnesota, 1995 to 2012. Yearly rates (smoothed using 3-year moving average) per 100,000 persons have been standardized by the direct method to the age and sex distribution of the US population in 2010. CHD = coronary heart disease; MI = myocardial infarction.
