I would be especially interested in seeing percentage of single founder applicants (vs total applicants) and percentage of single founder companies accepted (vs total companies accepted).
Given the number of people that post about looking for a cofounder here, I'm just guessing that a lot of people don't have one, but feel that they've got a good enough idea to make a business. Some of them really will have what it takes; but I'm sure the proportion of single founders that apply is quite different that the proportion of single founders that are accepted.