The 13 ranked programs would be for an average independent applicant, right? It lumps together US citizen IMG, FMG/noncitizem, and DO. I would think, though have no stats to back it up, that a DO with a decent/average USMLE score and pretty good grades and comments on the dean's letter, etc. would do better than the "average" independent applicant in the IM Match. If I were a DO graduating and doing the allo IM match, though, there's no way I would apply to only 15 programs. I think I'd apply to 30-40 and then I'd do at least 15 interviews if I could get them. You don't want to risk not matching because that's not a position you want to be in (scrambling).