Defensive efficiency: opponent points per possession (PPP--more about this stat) Conference games only, thru February 7 1. Illinois (0.92) 2. Wisconsin (0.95) 3. Iowa (0.96) 4. Ohio State (0.97) 5. Minnesota (0.99) 6. Michigan State (0.99) 7. Indiana (1.02) 8. Michigan (1.05) 9. Northwestern (1.06) 10. Purdue (1.06) 11. Penn State (1.14)