Efficiency margin: points per possession (PPP) minus opponent PPP (more about these stats) Thru December 18 1. Illinois (+0.26) 2. Indiana (+0.24) 3. Ohio State (+0.21) 4. Wisconsin (+0.19) 5. Michigan (+0.18) 6. Iowa (+0.16) 7. Michigan State (+0.10) 8. Minnesota (+0.09) 9. Penn State (+0.06) 10. Northwestern (-0.01) 11. Purdue (-0.05)