OOS % alone is limited in its ability to indicate how OOS friendly schools are. Some schools will really only look at OOS applicants if they are from that region (i.e., neighboring state) or have ties to that state (e.g., grew-up there, majority of family is there, went to school there etc.) So just because a school has a history of high OOS matriculants doesn't mean there aren't other significant underlying factors into schools' consideration of their applications. Other factors which may skew this are if the school has an MD/PhD program, as the residency of these applicants are sometimes looked at with less consideration. Also, schools may be only willing to consider OOS applicants if they have outstanding numbers, are URM, are applying through a separate application process for minorities, are WICHE applicants, etc. So as I initially said % of OOS matriculants is limited in its ability to show just how OOS friendly a school is.