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a.A cohort study of the effect of a new lipid-lowering medication on the incidence of CHD that is limited to non-smokers 50 years of age.
a.A cohort study of the effect of a new lipid-lowering medication on the incidence of CHD that is limited to non-smokers 50 years of age.
Options: Is this Restriction, matching, stratified analysis, randomization or mediation?
Briefly justify why you chose this option?
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