Post hoc analyses indicated that there was a significant fall in ERI for patients with the highest baseline ESA resistance dialysed with the VE ( 9.28 [ 7.70-12 .5 ] versus 7.70 [ 5.34-12 .7 ] IU/week/kg / g/dL Hb , P = 0.01 ) but not the control membranes ( 9.45 [ 7.62-12 .3 ] versus 8.14 [ 4.44-15 .6 ] IU/week/kg / g/dL Hb , P = 0.41 ) ; this was not attributable to changes in CRP levels .