Table 2.

Pearson correlation matrix among clinical continuous variables (n = 107).

Variable	Pre-dialysis blood urea nitrogen	Pre-dialysis serum creatinine	Pre-dialysis serum uric acid	Blood glucose	Serum potassium	Serum sodium	C-reactive protein	Urea clearance	OHIP‑14	SESS
Pre-dialysis blood urea nitrogen (mmol/L)	1.00	0.68***	0.18	0.10	0.07	−0.09	0.52***	−0.49***	0.68***	−0.55***
Pre-dialysis serum creatinine(μmol/L)	0.68***	1.00	0.21*	0.09	0.08	−0.07	0.55***	−0.51***	0.71***	−0.58***
Pre-dialysis serum uric acid(μmol/L)	0.18	0.21*	1.00	0.05	0.11	−0.04	0.15	−0.12	0.12	−0.09
Blood glucose (mmol/L)	0.10	0.09	0.05	1.00	0.02	−0.01	0.08	−0.05	0.08	−0.06
Serum potassium(mmol/L)	0.07	0.08	0.11	0.02	1.00	0.13	0.06	−0.04	0.04	−0.03
Serum sodium(mmol/L)	−0.09	−0.07	−0.04	−0.01	0.13	1.00	−0.08	0.06	−0.06	0.05
C-reactive protein(mg/L)	0.52***	0.55***	0.15	0.08	0.06	−0.08	1.00	−0.45***	0.70***	−0.51***
Urea clearance	−0.49***	−0.51***	−0.12	−0.05	−0.04	0.06	−0.45***	1.00	−0.63***	0.48***
OHIP‑14	0.68***	0.71***	0.12	0.08	0.04	−0.06	0.70***	−0.63***	1.00	0.74***
SESS	−0.55***	−0.58***	−0.09	−0.06	−0.03	0.05	−0.51***	0.48***	−0.74***	1.00

*Correlation coefficients (r) are shown. *p < 0.05, **p < 0.01, ***p < 0.001 (two tailed).