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1,000 men with no prior evidence of prostate cancer were enrolled in a study. The men...

1,000 men with no prior evidence of prostate cancer were
enrolled in a study. The men were followed by investigators
for 4 years. Each year,
the men were tested for the presence of prostate cancer. The
results as follows: 10 cases were
confirmed after 1 year 15 additional cases were confirmed after 2
years 20 additional cases were confirmed after 3 years 25
additional cases were confirmed after 4 years What is
incidence density of prostate cancer in this group?

math   Statistics-And-Probability   
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