Efficiency margin: points per possession (PPP) minus opponent PPP (more about these stats) Conference games only, thru January 29 1. Ohio State (+0.13) 2. Illinois (+0.12) 3. Wisconsin (+0.12) 4. Michigan (+0.08) 5. Michigan State (+0.04) 6. Iowa (+0.03) 7. Indiana (-0.05) 8. Northwestern (-0.06) 9. Minnesota (-0.11) 10. Purdue (-0.12) 11. Penn State (-0.14)