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Table 2 Associations between participant characteristics and ERI by simple linear regression

From: Association between serum alkaline phosphatase and primary resistance to erythropoiesis stimulating agents in chronic kidney disease: a secondary analysis of the HERO trial

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
  1. The following non-normally distributed variables were transformed to normality of distribution:
  2. asquare root
  3. blog-transformed
  4. creciprocal of square root
  5. dpower of 3
  6. ereciprocal