Question: How do you solve this question: 160 healthy firemen were followed for development of COPD. After being followed for 5 years 15 developed COPD. Twenty

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160 healthy firemen were followed for development of COPD. After being followed for 5 years 15 developed COPD. Twenty firemen were followed for 2 years and then left for other jobs. The remaining firemen never developed COPD and were followed for 10 years.

Calculate the number of person-years of observation accrued by the population. Write a sentence interpreting your answer. (2 point)

Calculate the incidence density of COPD amongst firemen. Write a sentence interpreting your answer. (2 points)

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