Defensive efficiency: opponent points per possession (PPP--more about this stat) Conference games only, thru February 12 1. Illinois (0.94) 2. Wisconsin (0.94) 3. Iowa (0.95) 4. Minnesota (0.98) 5. Ohio State (0.98) 6. Michigan State (0.98) 7. Indiana (1.02) 8. Northwestern (1.04) 9. Purdue (1.07) 10. Michigan (1.09) 11. Penn State (1.16)