MCQ:- Cholesterol-lowering drug in the primary prevention of coronary heart disease

[samer]

A randomised double-blind placebo controlled study of a cholesterol-lowering drug in the primary prevention of coronary heart disease was conducted over a five-year follow up period. The absolute risk of myocardial infarction in the group-receiving placebo during this time was 10 per cent.
The relative risk of those given the cholesterol lowering medication was 0.8. What number of patients will need to be treated with active drug for five years to prevent one myocardial infarction?


1) 20
2) 40
3) 5
4) 80
5) 100


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