Risk differences, risk ratios, odd ratios. Oh my!

Let's compare and contrast.

Select the best response!

Select one:

a. As n gets large, they all estimate the same quantity.

b. Odds ratios are good for case-control studies but can be used more widely. Risk ratios measure the strength of association. Risk difference measures the impact of the association.

c. Odds ratios can be used only for case-control studies. Risk ratios can be used only for cohort or clinical trials (or other prospective studies). Risk differences can be used only for cohort (or other prospective) studies.

d. Odds ratios can be used only for case-control studies. Risk ratios can be used for case control studies or cohort studies. Risk differences can be used only for prospective studies.