Middle Ear Infection

They also found that among children who were delayed at 24 months, low maternal education predicted delay even more strongly at 48 months (OR = 30.5)
What does OR stand for?

OME delayed cognitive development in children with OMR when compared to those without OME at 5
-I know what OME stands for but what does OMR stand for?

You might check your psychology textbook. Otherwise, here are some usual meanings for those two:

OR = operating room, operations research

OMR = Optical Mark Recognition or Optical Mark Reading

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