Board scores are kind of off for those. It really is a lot more fluid than that anyway.
Ortho, optho, and rads usually have pretty close Step 1 scores. Many of the other specialties like rad/onc, derm, neurosurgery, etc. aren't significantly greater in terms of averages, especially since it only takes a couple of people to sway those specialty hours in either direction. When you get into the super competitive fields, your clinical grades, LORs, research, and all that other crap begin to play a much bigger role since everyone has pretty strong step 1 scores who is applying.
As far as EM/IM? It just depends. Normal EM programs tend to be in the 220+ range, but they also tend to value step 1 scores less than your personality and whether they can get along with you. EM is one of those fields where it is ok if you weren't a stellar tester, as long as you are a hardworker and aren't a d-bag. (All these things have their limits of course) EM/IM tends to attract a a crowd that is into critical care and likes to change between places, which is usually best afforded at academic centers. I do know one that changes it up and rotates between Hospitalist/ICU stuff and ED in private practice, so it isn't impossible if you had a change of heart.
