Imagine that a study of prostate cancer was initiated in Des Moines, Iowa. A total of 1,000 men, 55-64 years of age, with no prior evidence of prostate cancer were enrolled in the study. Each year during the study, the men being observed were examined and tested for presence of prostate cancer.  The results of annual examinations revealed: 10 cases confirmed at 1st exam                15 additional cases at 2nd exam                20 additional cases at 3rd exam                25 additional cases at 4th (final) exam                What is incidence density of prostate cancer in this group?

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  1. Imagine that a study of prostate cancer was initiated in Des Moines, Iowa. A total of 1,000 men, 55-64 years of age, with no prior evidence of prostate cancer were enrolled in the study. Each year during the study, the men being observed were examined and tested for presence of prostate cancer.  The results of annual examinations revealed:

10 cases confirmed at 1st exam

               15 additional cases at 2nd exam

               20 additional cases at 3rd exam

               25 additional cases at 4th (final) exam

               What is incidence density of prostate cancer in this group?

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