Expert: ronny fisher - 9/12/2009

Question
Hello Ronny.  In the results of a research study, an author says that a group of treated patients was more likely to have a certain outcome than a control group (O.R.= 0.69, 95% C.I.=0.58-0.74).

I know that C.I. is a confidence interval, but can you tell me what O.R. stands for?  I would really appreciate your help on this one!

Jeff

Answer
jeff -

the abbreviation O.R. is not standard in statistics, as far as i am aware.
it could mean 'observed result' or perhaps 'observed ratio'.
without seeing the context in which it was used, i can only speculate on
what the author meant.

ronny