Question: Consider studies designed to compare the occurrence of a binary outcome between two populations: population A and population B. In general, which of the following

Consider studies designed to compare the occurrence of a binary outcome between two populations: population A and population B. In general, which of the following statements best describes the relationship between the relative risk estimate (RR)and the odds ratio estimate (OR), both based on the same two samples from populations A and B?

a.RR and OR will always be exactly the same in value.

b.If RR is greater than 1 then OR will be less than 1.

c.RR and OR may differ in value, but will show the same direction of association.

d.RR and OR may differ in value, but will never differ by more than 10%.

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