Table 2. Differences of clinical and laboratory characteristics in relation to the CRP level of the patients at King Abdulaziz Medical City and the South and North Dialysis Centers of King Abdullah Dialysis Program.

PTH: Parathyroid hormone; SBP: systolic blood pressure; DBP: diastolic blood pressure; CRP: C-reactive protein

Variables	Overall Mean ± SD	High Mean ± SD	Normal Mean ± SD	p-value
Mean predialysis SBP of the last three dialysis sessions (weekend sessions)	145.0 ± 22.1	145.0 ± 21.9	145.9 ± 24.3	0.818
Mean predialysis DBP of the last three dialysis sessions (weekend sessions)	66.9 ± 13.8	66.3 ± 13.6	69.3 ± 15.0	0.229
Mean postdialysis SBP of the last three dialysis sessions (weekend sessions)	137.5 ± 18.6	136.6 ± 19.3	139.5 ± 16.1	0.408
Mean postdialysis DBP of the last three dialysis sessions (weekend sessions)	65.3 ± 11.7	64.7 ± 11.4	68.2 ± 12.7	0.100
Mean weight gain in the last three dialysis session (weekend session)	1.98 ± 1.06	1.96 ± 1.14	2.13 ± 0.75	0.394
Charlson comorbidity index	6.70 ± 2.89	6.92 ± 2.86	5.75 ± 3.05	0.063
Calculated Erythropoietin Index	20.5 ± 30.4	18.4 ± 11.7	26.9 ± 51.4	0.070
Erythropoietin dose per week	41.8 ± 26.7	40.7 ± 26.5	40.6 ± 25.2	0.976
Hb level	108.4 ± 19.1	109.1 ± 18.9	107.7 ± 20.8	0.689
Ca level	2.23 ± 0.25	2.23 ± 0.26	2.22 ± 0.21	0.800
Phosphorus level	1.49 ± 0.54	1.50 ± 0.56	1.53 ± 0.49	0.791
Na level	133.8 ± 3.92	133.9 ± 3.88	133.3 ± 4.16	0.334
Serum albumin level	34.5 ± 4.46	36.6 ± 4.43	36.9 ± 4.55	0.745
Total serum cholesterol	3.71 ± 0.98	3.67 ± 0.99	3.88 ± 0.91	0.223
Predialysis serum creatinine	647.4 ± 256.4	656.8 ± 257.3	664.1 ± 242.2	0.874
PTH level	64.4 ± 55.7	65.9 ± 59.6	60.6 ± 40.4	0.607
Ca X P product	3.32 ± 1.33	3.34 ± 1.37	3.35 ± 1.17	0.957
Kt/V	1.22 ± 0.28	1.19 ± 0.28	1.32 ± 0.28	0.009 **