Defensive efficiency: opponent points per possession (Opp. PPP--more about this stat) Thru December 18 1. Iowa (0.80) 2. Illinois (0.86) 3. Michigan (0.88) 4. Indiana (0.91) 5. Minnesota (0.93) 6. Ohio State (0.94) 7. Northwestern (0.95) 8. Wisconsin (0.96) 9. Penn State (1.00) 10. Purdue (1.02) 11. Michigan State (1.04)