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a study of prostate cancer was initiated in Des Moines, Iowa. A total of 1,000 men,...

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a study of prostate cancer was initiated in Des Moines, Iowa. Atotal of 1,000 men, 55-64 years of age, with no prior evidence ofprostate cancer were enrolled in the study. Each year during thestudy, the men being observed were examined and tested for thepresence of prostate cancer. The results of the annual examrevealed: 10 cases confirmed at the 1st exam, 15 additional casesat 2nd exam, 20 additional cases at 3rd exam, 25 additional casesat the 4th exam. What is the incidence density of prostate cancerin the group?

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