I realize that the number of hands is small, but the difference is so huge that I think it may be more than just sample size. Over 14,082 hands my positional bb/100 outside of the blinds is as follows:

UTG: 34.51
MP: 36.37
CO: 2.37
BTN: 8.80

Am I just really bad at defending my steals and raises? The big difference has me kind of shocked.