Which of the Following Is True Concerning the Incidence and Prevalence

Which of the following is true concerning the incidence and prevalence of ischemic heart disease in the United States?

A) About 50% of the population is estimated to have some form of cardiovascular disease.
B) Cardiovascular disease begins in middle life.
C) The annual mortality rate for cardiovascular diseases has been declining since 1940.
D) Cancer has replaced coronary heart disease as the leading cause of death in the United States after age 65.

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