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I wondered if it is possible to calculate the inverse of an IRR like we can for odds ratio (inverse = 1/x).

For example:

IRR = 1.40, 95% CI = 1.18 -1.65

Inverse IRR: = 1/1.40 = 0.71

Thank you (Using Stata 11)

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Yes, that just gives you the rate ratio with 1 as the referent group instead of 0 (for a binary variable) or for a one unit decrease in the variable (for a continuous variable) exactly as with a risk ratio or odds ratio.

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