Defensive efficiency: opponent points per possession (Opp. PPP--more about this stat) All games, thru January 16 1. Iowa (0.82) 2. Illinois (0.86) 3. Minnesota (0.91) 4. Wisconsin (0.92) 5. Northwestern (0.93) 6. Ohio State (0.95) 7. Indiana (0.95) 8. Michigan (0.95) 9. Purdue (1.01) 10. Michigan State (1.01) 11. Penn State (1.02)