ADHD has very high co-morbitity rates with all sorts of other dxes... from learning disabilities (dyslexia, dysgraphia, dyscalcula, etc.), to motor skills issues (per CanChild, 50% of kids with ADHD also have Developmental Coordination Disorder (DCD)), to auditory issues and other things where the co-morbidity rates are not known.
ADHD plus "other stuff" can and does lead to ODD if the "other stuff" is not found and dealt with at an appropriate age. been there done that. Solved the "other stuff" and the ODD went away. But the ADHD actually had NO link to the ODD, as far as we could tell.
For argument, take a kid who is not ADD/ADHD, but has other issues like learning disabilities etc (as above)... and fail to deail with those issues, and I'd be fairly certain that the result will be ODD... without the ADHD.
Of course, people on this board already know these things. It just takes the research world at least 20 years to catch up with parents!
