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Debate surrounds the relative contributions of preventive and treatment strategies to recent reductions in deaths from coronary heart disease (CHD). These investigators used epidemiologic data from Ontario, Canada, and the IMPACT CHD mortality model (slide presentation available on the Liverpool University website) to address this issue.
Between 1994 and 2005, the age-adjusted CHD mortality rate in Ontario residents aged 25–84 fell 35%, from 191 to 125 deaths per 100,000 residents. Changes in population risk factors accounted for 48% of the decrease, whereas medical and surgical treatments accounted for 43% (9% of the decrease was unaccounted for by variables included in the model). The 75-to-84-year-old age group had the greatest absolute r…