Table 1 Baseline patient characteristics

Age, years

59 ± 15

59 ± 17

58 ± 14

NS

Male, %

53.7

54.5

53.3

NS

White, %

63.8

71.4

59.5

NS

 Nephrosclerosis

30.8

22.7

34.9

NS

 Diabetic Nephropathy

24.6

22.7

25.6

 Glomerulonephritis

12.3

9.1

14.0

 Others and unknown

32.3

45.5

25.5

 Diabetes

41.5

40.9

41.9

NS

 Hypertension

81.5

77.3

83.7

NS

 Myocardial infarction

10.6

4.5

13.6

NS

 Stroke

4.5

0

6.8

NS

 Congestive heart failure

15.2

9.1

18.2

NS

 Atrial Fibrillation

7.6

9.1

6.8

NS

 Peripheral arterial disease

12.1

9.1

13.6

NS

 COPD

6.1

0

9.1

NS

Married, %

60.9

63.6

59.5

NS

 Before ninth grade

77.8

81.8

75.6

NS

 Up to high school

15.9

18.2

14.6

 College/University

6.3

0

9.8

 eGFR, (ml/kg/1.73m²)

16 ± 7

14 ± 6

17 ± 7

NS

 Creatinine (mg/dL)

4.1 ± 1.7

4.4 ± 1.6

4.0 ± 1.8

NS

 Urea (mg/dL)

124 ± 50

127 ± 47

123 ± 52

NS

 Potassium (mmol/L)

4.7 ± 0.7

4.7 ± 0.7

4.7 ± 0.7

NS

 Albumin (g/dL)

4.0 ± 0.6

4.1 ± 0.6

4.0 ± 0.6

NS

 Phosphorus (mg/dL)

5.0 ± 2.1

5.3 ± 2.4

4.9 ± 2.0

NS

 PTH (pg/mL)

177 (107, 292)

215 (112, 265)

153 (98, 298)

NS

 Total Calcium (mg/dL)

9.2 ± 0.8

9.0 ± 1.0

9.3 ± 0.7

NS

 25-hydroxyvitamin D (ng/mL)

23.5 ± 11.3

20.8 ± 14

25.2 ± 9.2

NS

 Bicarbonate (mmol/L)

21.4 ± 6.3

20.3 ± 8.5

22.1± 4.6

NS

 Alkaline phosphatase (UI/L)

103 ± 61

114 ± 44

98 ± 69

NS

 Iron (μg/ml)

68.6 ± 28.8

75 ± 41

65 ± 20

NS

 Ferritin (ng/ml)

176 (79, 394)

121 (65, 368)

209 (92, 408)

NS

 Hemoglobin (g/L)

11.0 ± 2.8

10.9 ± 3.1

11.1 ± 2.6

NS