Can an odd ratio be as low as <0.001?

[lily2707]

With a 95% CI of <0.001 to >999.999? Any idea what could be wrong?

(Sorry about the french output, will gladly provide more info if needed)

Thanks a lot!

 

[hlsmith]

This is likely related to complete separation of data, meaning that the predictor almost perfectly explains the outcome.

You can explore this by creating a 2x2 table of variable and outcome.

 

[noetsi]

Other things can cause strange results like multicolinearity as well.