This is straight from their website, on the same page:
Credentials Required for Admission

Bachelor of Science or Arts degree
GPA: 2.7
Total Science GPA: 2.7
DAT: 17 (in each of the eight categories)

STATISTICS ON FALL 2004 CLASS
- The average age ranged from 21 to 24
- 55% are females
- 78% are underrepresented minorities
- Class size: 83
- Average GPA: 3.04
- Average DAT Total Science: 15- National Board Results: Average passing score Part I 80% and Part II 83%

How is it, that you have to have a 17 in every category, yet a class average on ts is 15?

each year it gets more competetive. 20 years ago you could get in with 16AA in most schools. last year the dat average score was 17, but this year it went up to 18.