Defensive efficiency: opponent points per possession (Opp. PPP--more about this stat) Thru December 27 1. Iowa (0.80) 2. Illinois (0.85) 3. Indiana (0.90) 4. Northwestern (0.93) 5. Minnesota (0.93) 6. Michigan (0.93) 7. Ohio State (0.94) 8. Wisconsin (0.96)9. Penn State (0.97)10. Purdue (0.99) 11. Michigan State (1.03)