Jude,
Thanks for your quesitons, I'll try to cover them all from my perspective.
1. First, all programs handle their ranking differently so it's VERY difficult for me to tell you how that's done for anyone else. But impression wise, I would not say everyone coming to interview is on equal footing. I'm not just talking numbers. I know of students who had fairly decent numbers and did not match and those with average numbers who did. I imagine there are some programs that are all about numbers. We are looking for someone who is a good fit. We have more than one person interview candidates and all interviewers discuss the candidate and their impression of them together to come up with a composite idea. Often it's as simple as, "Nice guy, good numbers, I don't know if he's a good fit for our program". Or conversely, "Nice guy, average numbers, but seems like a hard worker and a good fit for the program". What determines those things? Nothing you can really control... it's just personality, what seems important to you, your priorities and expectations, etc. And you should be honest about these things and not try to put on a show, because you will only end up in a bad fit if you put on too much of an act.
I would not say the ball is in the applicant's court once they are offered an interview. Just like the ball isn't in a job applicant's court when he goes to interview with the boss. If your numbers are astronomical, you're probably at a better footing then someone with lower numbers. But you'd best believe if that guy comes off as a weasel, cocky or disinterested or like he's going to be unable to step up to the plate, his numbers suddenly don't matter as much. In summary, yes board scores help, yes it sets up high expectations. But the interview DOES matter. Average board scores (220s, 230s) are still very good candidates, presuming you make a good impression and your interviewers think you're a good fit, you'll do well. Below 220s you've got you work cut out for you, but just be yourself and be confident. Know that you can do a good job, play up other aspects of your application without being pushy and stand firm when questioned on your scores. Actually, everyone should stand firm (or at least have an answer prepared) on any less than stellar performance (class rank, grades, scores, etc).
2. As far as the JBJS article goes, I'm presuming since it mentions 'politeness at interviews' that this is AFTER you've been selected, not determining IF you'll get an interview. I would say if you have high board scores it's a plus, without a doubt. If you have lower board scores they want to see something special about you, but again this is something you can't plan for, it's mostly fit. Which goes along with politeness, although I don't know about the appearance. I have never seen someone walking into an interview in jeans... frankly you all look very much alike on interview day
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If it's referring to race or sex, I'm sure some programs do take that into consideration, I am a part of a very diverse program so it never comes into play for us. I would say more than class rank your rotation grades tend to be discussed more as in "he high passed 5 rotations and only honored 1". So I would put that above class rank. Letters of recommendation are reviewed and mostly noted if they have something outstanding to say, "Dr. so and so raved about him and said he's the best student to come through his program in the past 5 years" (good thing). Or three letters saying, "He is a good candidate, we recommend him for your program" (ie YOUR program, not ours). I myself wonder why if someone is SO gung ho about our program (calling me incessantly asking when invites will go out because they so want to go to our program) why they did not do a rotation here? For the candidates that DO do a rotation with us, it's a risk but it's a necessary one. Either the residents liked you, didn't like you, or didn't have much to say one way or the other. If they didn't like you, it's not a good thing. We will not rank a rotator who the residents deemed poor highly, they will be the ones working with the student once they become a resident and they know who they want to have as part of their team. However if you're good, we know it, we want you.
I know THAT was a lot to digest. Hopefully it was somewhat helpful to you. I think a lot of what it comes down to is candidates trying to mold themselves to what they think a program wants to hear. But that's a bad idea for everyone involved because if you make yourself out to be something you're not, you may match, but to the 'wrong' program. At this point, you've done all you can do as far as your grades, rotations, board scores go. All you can do now is show up to your interviews, put on a nice suit and brush your hair, be polite to everyone you meet, and be yourself. If that means being more quiet, that's ok. If it means being talkative and laughing it up with the residents, do that. One tip: if you've done any research, KNOW about it. I've often heard interviewers say, "well I asked him/her about their research and they sort of hemmed and hawed, but it doesn't appear THEY actually did any of it". Even if you're more on the shy side - especially if you're on the shy side - think of some things to talk about so there isn't too much dead air... a question to ask about the program, something interesting to share. Interviewers don't like sitting in a silent room any more than you do, be prepared in case it happens.
I guess this ended up being more of a 'tips for interviews' which I could do in a separate message if people were interested, I imagine most of your schools have some sort of program where this is reviewed, I don't know that I'd have much more to offer than they would.
I hope this answers some of your questions.