There was no significant difference between the HDF and HD treatment groups in rate of change in LVM ( HDF : change , -@ g/yr -LSB- @ % confidence interval ( @ % CI ) , -@ to @ g -RSB- ; HD : change , @ g/yr -LSB- @ % CI , -@ to @ g -RSB- ; P for difference = @ ) , EF ( HDF : change , -@ % / yr -LSB- @ % CI , -@ % to @ % -RSB- ; HD : change , -@ % / yr -LSB- @ % CI , -@ % to -@ % -RSB- ; P = @ ) , or PWV ( HDF : change , -@ m/s per year -LSB- @ % CI , -@ to @ m/s ) ; HD : change , @ m/s per year -LSB- @ % CI , -@ to @ m/s -RSB- ; P = @ ) .