Table-IV.

Changes of residual renal function of the two groups.

Variables	HD group		PD group
	At the start of dialysis	After a year of dialysis	At the start of dialysis	After a year of dialysis
Blood creatinine (umol/L)	781.5±172.9	621.6±86.1*	791.2±193.2	680.2±95.7
Blood urea nitrogen (mmol/L)	21.5±3.6	18.0±3.2*	21.5±3.9	18.1±3.7*
PTH (pg/ml)	261±87.2	209.1±65.7*	245.3±84.2	213.1±64.9*
GFR (ml/min/1.73m2)	8.23±0.95	6.59±0.61	8.21±0.97	7.42±0.81#

^*p<0.05 for comparisons between data of the same group before and after a year of dialysis

^#p<0.05 for comparisons between the two groups after a year of dialysis.