# math(epidemiology)

A population of 100 healthy men was followed for the development of prostate cancer.

After being followed for 5 years, 20 men developed prostate cancer. Ten other men were followed for 1 year and then were lost to follow-up. The remaining men who never developed the disease were followed for 10 years. Calculate the number of person-years of observation accrued by this population.

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3. 👁 970
1. 5*20 + 1*10 + 10*70

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2. Thank you for your help Steve, I used that equation and got 810py but I assumed my answer was wrong because I got such a big number.

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3. when you're talking about 100 people, expect big numbers if covering a long time.

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4. 845

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5. 0.85
856
785
456

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