I agree with sithr. It all depends on the school as to the movement of the waitlist. Even so, most DO schools have deposit deadline on Dec. 15, so if the accepted applicants do not turn in their deposit, thus forfeiting that seat, so more spots are available. What also matters is what position of the waitlist you're in...top third, middle, or bottom third. I would send letter of intent or updates to schools that you're waitlisted in. Semester grades, research, volunteer activity, shadowing, etc...