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a group of of researchers are interested in conducting a clinical trial to determine whether a new cholesterol lowering agent was useful in preventing coronary heart disease (CHD). They identified 14,327 potential participants for the trial. At the intinial clincal exam 422 were discovered to have CHD. The remaining subjects entered the trial and were divided into the treatment and placebo groups. Of those in the treatment group, 535 develop CHD after 5 years of follow up while 568 developed CHD during the same period and the placebo group. what was the prevalence of CHD at the initial exam?

group of researchers are interested in conducting a clinical trial to determine whether a new cholesterol-lowering agent was
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