Suppose you have two groups $A$ and $B$ and you want to find the odds ratio of some outcome. How do you denote this odds ratio? Is it just $OR(\text{A} \ \text{and} \ B)$?

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    $\begingroup$ I think if your context is written clear enough, especially in the reference level that you defined, you can just use OR. Readers can understand the odds ratio is for A versus B. $\endgroup$ – cchien Nov 9 '11 at 18:59
  • $\begingroup$ Did you browse some of the related questions and answers? Presenting results depends on whether you compute OR from a two-way table or a regression model, but usually @cchien's recommendation works well in practice. $\endgroup$ – chl Nov 9 '11 at 22:30

I've seen in some textbooks: $OR_{A/B}$

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