[RESULTS] There was no significant difference between the HDF and HD treatment groups in rate of change in LVM ( HDF : change , -0.9 g/yr [ 95 % confidence interval ( 95 % CI ) , -8.9 to 7.7 g ] ; HD : change , 12.5 g/yr [ 95 % CI , -3.0 to 27.5 g ] ; P for difference = 0.13 ) , EF ( HDF : change , -0.3 % / yr [ 95 % CI , -2.3 % to 1.8 % ] ; HD : change , -3.4 % / yr [ 95 % CI , -5.9 % to -0.9 % ] ; P = 0.17 ) , or PWV ( HDF : change , -0.0 m/s per year [ 95 % CI , -0.4 to 0.4 m/s ) ; HD : change , 0.0 m/s per year [ 95 % CI , -0.3 to 0.2 m/s ] ; P = 0.89 ) .