If you look at program stats you will see that programs will interview and rank more candidates if they are filling more slots. This will vary some with the prestige/competetiveness of specific sites--but even highly competitive sites can wind up in Match II because of how their candidates ranked other sites:I was curious about this as well, as a number of the tracks I interviewed for only have one position. However, it also seemed to me like those tracks interviewed fewer people than tracks that accept more interns... so I'm thinking there may not be a big difference in terms of match rate for those positions. But who knows?!
RANKINGS IN PHASE I
Average Number of Applicants Ranked Per Position Offered for Each Program:
Programs Filling All Positions
8.4
Programs With Unfilled Positions
3.5
All Programs
7.4