Efficiency margin: points per possession (PPP) minus opponent PPP (more about these stats) Conference games only, thru February 7 1. Ohio State (+0.14) 2. Illinois (+0.12) 3. Michigan State (+0.06) 4. Wisconsin (+0.06)5. Iowa (+0.05) 6. Michigan (+0.02) 7. Indiana (-0.02) 8. Northwestern (-0.08) 9. Purdue (-0.10) 10. Penn State (-0.12) 11. Minnesota (-0.13)