Table 2.

Associations between participant characteristics and ERI by simple linear regression

Variable	R2	P value
Women (Reference men)	−0.02	0.8
Non-Caucasians (Reference Caucasians)	−0.02	0.7
Diabetes mellitus (Reference non-diabetics)	0.01	0.2
Cause of kidney disease	−0.03	0.6
Smoking status	−0.02	0.6
Body mass index	0.02	0.2
Ischemic heart disease	−0.01	0.4
Congestive heart failure	0.02	0.2
Age	0.01	0.2
Reticulocyte count	−0.01	0.6
Total white cell count	−0.02	0.8
Ferritina	−0.01	0.5
Transferrin saturationb	−0.01	0.6
Albumin	0.001	0.3
Alkaline phosphatasec	0.06	0.03
Gamma-glutamyltransferaseb	0.01	0.2
Alanine transaminasec	0.02	0.1
Aspartate transaminasec	0.04	0.09
Lactate dehydrogenaseb	0.07	0.05
Albumin-corrected calcium	0.05	0.06
Phosphate	−0.02	0.9
Parathyroid hormonea	0.04	0.09
C-reactive protein	0.03	0.09
Total F2-isoprostanesb	−0.01	0.5
Glutathione peroxidise activityd	−0.004	0.9
Superoxide dismutase activitye	−0.01	0.5
Protein carbonylse	−0.03	0.9

The following non-normally distributed variables were transformed to normality of distribution:

^asquare root

^blog-transformed

^creciprocal of square root

^dpower of 3

^ereciprocal