If I have 3 groups,and for each group,I get the ratio(e.g. incidence rate).
Now I wanna compare 3 ratio pairwise,and get the corresponding p values,i.e:
group1 vs group2  ,p value=?
group1 vs group3 ,p value=?
group2 vs group3 ,p value=?

Which statistical test  should be used?

Thanks a lot for your help.

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