Table 3.

Linear regression analyses (R² values) between the natural logarithmic functions of different uremic retention solute concentrations as a function of the eGFR as calculated according to four different methods

		MDRD	C-G	epi-GFR	Stevens
SCrea		0.833	0.737	0.737	0.570
SDMA		0.237	0.300	0.309	0.320
ADMA		0.108	0.149	0.167	0.193
UA		0.054	0.062	0.058	0.062
IS	Total	0.416	0.426	0.426	0.361
HA	Total	0.107	0.141	0.130	0.117
pCS	Total	0.150	0.129	0.119	0.085
IAA	Total	0.123	0.134	0.132	0.115
CMPF	Total	0.035	0.016	0.014	0.009
IS	Free	0.265	0.289	0.282	0.257
HA	Free	0.122	0.160	0.147	0.134
pCS	Free	0.203	0.175	0.164	0.124
IAA	Free	0.218	0.257	0.253	0.238

C-G, Cockcroft-Gault; SCrea, serum creatinine; MDRD, Modification of Diet in Renal Disease. All correlations were significant (P <0.05) except total CMPF. R² values <0.2 are in bold.