Here are the stats from the AAMC on medical student debt, they seem to be close to this poll:
Class of 2001 debt:
Mean all schools: 99,089
Median all schools: 97,000
Mean public schools: 86,630
Median public schools: 86,000
Mean private schools: 118,546
Median private schools: 120,000
Percent at 150K or higher
All schools: 15%
Public: 7%
Private: 35.5%