Efficiency margin: points per possession (PPP) minus opponent PPP (more about these stats) Conference games only, thru January 23 1. Ohio State (+0.16) 2. Wisconsin (+0.12) 3. Michigan (+0.07) 4. Michigan State (+0.05) 5. Indiana (+0.03) 6. Illinois (+0.03) 7. Iowa (-0.06) 8. Northwestern (-0.07) 9. Penn State (-0.08) 10. Purdue (-0.12) 11. Minnesota (-0.14)