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A population of 100 healthy women was followed up for the development of breast cancer. 20...

A population of 100 healthy women was followed up for the development of breast cancer. 20 women were followed‐up for 1 year and were then lost to follow‐up. After being followed-up for 5 years, 10 women developed breast cancer. The remaining women who never developed breast cancer were followed for 10 years. Calculate the incidence rate of breast cancer in this population.

A. 14 per 1000 person years

B. 10 per 1000 person years

C. 13 per 1000 person years

D. 12 per 1000 person years

What is the reasoning for the answer?

Math   Statistics-And-Probability   
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