In a cohort study, men were classified as having high or low cholesterol levels. Among the group with low cholesterol levels there were 50 heart attacks in 5000 person-years of follow-up and among the group with high cholesterol levels there were 150 heart attacks in 6000 person-years of follow-up.   1. What was the incidence of heart attack among men with low cholesterol levels? 2. What was the incidence of heart attack among men with high cholesterol levels?  3. What was the incidence of heart attack all men?  4. If high cholesterol levels are a cause of heart attack, what proportion of heart attacks in men could theoretically be prevented if nobody had a high cholesterol level?

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