Here are some stats for the 08-09 matriculants:
Ponce: median mcat: 21, median gpa: 3.6
San Juan Bautista: median mcat: 20, median gpa: 3.3
Central del Caribe: median mcat: 21, median gpa: 3.5
University of Puerto Rico: median mcat: 23, median gpa: 3.8
San Juan Bautista enrolls the most out-of-state (30-40%), followed by Central del Caribe and then Ponce.
University of Puerto Rico does not even consider out-of-state unless:
"Highly qualified Puerto Rico non-residents must demonstrate strong ties to Puerto Rico. To determine strong residential ties to Puerto Rico, the Committee on Admission will review the applicant´s birthplace, high school attended, college attended and parent´s legal residence. An applicant who meets three of the four categories demonstrates strong ties to Puerto Rico."