Efficiency margin: points per possession (PPP) minus opponent PPP (more about these stats) Conference games only, thru February 19 1. Ohio State (+0.13) 2. Wisconsin (+0.10) 3. Illinois (+0.10) 4. Michigan State (+0.07) 5. Iowa (+0.04) 6. Michigan (0.00) 7. Minnesota (-0.06) 8. Indiana (-0.06) 9. Northwestern (-0.10) 10. Purdue (-0.10) 11. Penn State (-0.11)