Table 4. P and R-values for Spearman correlations between the solute concentrations and the different patient characteristics.

		Age	BW	Kt/V	PNA	RRF	vintage
urea	P	0.007	0.511	0.230	<0.001	0.561	0.210
	R	−0.320			0.894
Crea	P	0.009	0.009	0.048	0.004	0.207	0.332
	R	−0.311	0.312	−0.237	0.336
ADMA	P	0.657	0.880	0.118	0.577	0.608	0.950
SDMA	P	0.552	0.962	0.160	0.211	0.427	0.470
UA	P	<0.001	0.041	0.058	0.001	0.243	0.007
	R	−0.446	0.256		0.373		−0.336
β2M	P	0.913	0.837	0.742	0.506	<0.001	0.305
	R					−0.415
HA	P	0.962	0.490	0.668	0.005	<0.001	0.232
	R				0.330	−0.431
IS	P	0.967	0.196	0.801	0.046	0.022	0.282
	R				0.237	−0.272
IAA	P	0.658	0.602	0.140	0.801	0.101	0.782
PCS	P	0.456	0.941	0.712	<0.001	0.829	0.809
	R				0.529
PCG	P	0.825	0.734	0.651	0.003	0.004	0.540
	R				0.349	−0.335
CMPF	P	0.003	0.154	0.576	0.562	0.080	0.559
	R	0.346
Free HA	P	0.840	0.398	0.824	0.024	<0.001	0.229
	R				0.267	−0.453
Free IS	P	0.953	0.361	0.870	0.131	0.001	0.668
	R					−0.380
Free IAA	P	0.964	0.451	0.084	0.525	<0.001	0.653
	R					−0.410
Free PCS	P	0.959	0.612	0.664	<0.001	0.028	0.238
	R				0.445	−0.261
Free PCG	P	0.792	0.746	0.639	0.003	0.004	0.536
	R				0.346	−0.337

Crea: creatinine, ADMA: asymmetric dimethylarginine, SDMA: symmetric dimethylarginine, UA: uric acid, β₂M: beta-2-microglobulin, HA: hippuric acid, IS: indoxyl sulfate, IAA: indole acetic acid, PCS: p-cresylsulfate, PCG: p-cresylglucuronide, CMPF: 3-carboxy-4-methyl-5-propyl-2-furanpropionic acid.

BW: body weight, PNA: protein equivalent of nitrogen appearance, RRF: residual renal function.

P<0.05 is indicated in bold. R values only shown in case of significant P.