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Table 1 Demographics and clinical parameters of included subjects

From: The effect of increased frequency of hemodialysis on vitamin C concentrations: an ancillary study of the randomized Frequent Hemodialysis Network (FHN) daily trial

Baseline characteristics of Daily Trial participants with vitamin C measures

 

All (N = 44)

Conventional Hemodialysis (N = 20)

Frequent Hemodialysis (N = 24)

Characteristic

N Missing

mean +/-SD

N Missing

a

N Missing

a

Age (yrs.)

0

49.6 ± 12.1

0

50.6 ± 11.9

0

48.8 ± 12.4

Female sex (%)

0

16 (36%)

0

7 (35%)

0

9 (38%)

Hispanic ethnicity (%)

2

12 (29%)

2

3 (17%)

0

9 (38%)

Race

0

 

0

 

0

 

    Black White Native American

 

28 (64%)

 

14 (70%)

 

.14 (58%)

    Aboriginal Canadian

 

4 (9%)

 

0

 

4 (17%)

    Alaskan Native

 

3 (7%)

 

2 (10%)

 

1 (4%)

    First Nation Asian Native Hawaiian

 

2 (5%)

 

1 (5%)

 

1 (4%)

    Other Pacific Islander

 

1 (2%)

 

1 (5%)

 

0

    Other/mixed/unknown

 

6 (14%)

 

2 (10%)

 

4 (17%)

Duration of end-stage renal disease (%) < 2 yr. 2–5 yr. > 5 yr

11

.12 (36%) 15 (45%) 6 (18%)

4

.7 (44%) 9 (56%) 0

7

.5 (29%) 6 (35%) 6 (35%)

Diabetes (%)

0

13 (30%)

0

6 (30%)

0

7 (29%)

Residual kidney function (%) Anuria > 0 to 1 ml/min > 1 to 3 ml/min

0

.26 (59%) 9 (20%) 9 (20%)

0

.6 (30%) 5 (25%) 9 (45%)

0

.20 (83%) 4 (17%) 0

Equilibrated per session Kt/V urea

0

1.44 ± 0.20

0

1.46 ± 0.22

0

1.43 ± 0.19

Predialysis albumin (g/dL)

0

4.12 ± 0.34

0

4.15 ± 0.36

0

4.09 ± 0.32

Predialysis sodium (mEq/L)

0

139 ± 3

0

140 ± 3

0

139 ± 3

Predialysis potassium (mEq/L)

0

4.92 ± 0.59

0

4.83 ± 0.47

0

4.99 ± 0.68

Predialysis calcium (mg/dL)

0

9.35 ± 0.74

0

9.51 ± 0.83

0

9.22 ± 0.65

Predialysis hemoglobin (mg/dL)

0

12.1 ± 1.3

0

12.4 ± 1

0

11.8 ± 1.4

Predialysis Parathyroid hormone (pg/mL)

0

408 [283,927]

0

389 [246,1039]

0

471 [289,927]

Physical Health Composite score

0

40.3 ± 11.0

0

39.7 ± 9.6

0

40.9 ± 12.2

Mental Health Composite score

0

47.6 ± 12.4

0

45.8 ± 10.1

0

49.1 ± 14.0

Iron administration (Y/N)

0

1 (2%)

0

1 (5%)

0

0

Erythropoiesis-Stimulating Agents (EPO equivalent units)

0

9250 [3138,22,875]

0

8750 [2913,27,625]

0

9250 [3138,19,750]

Left Ventricular Mass (g)

0

166 ± 65

0

179 ± 66

0

155 ± 63

CRP (mg/dL)

10

0.362 [0.221,0.964]

4

0.412 [0.242,0.986]

6

0.362 [0.221,0.932]

  1. aPlus-minus values are means ±SD. Bracketed values are medians with interquartile ranges (chosen for skewness of data as per visual inspection of distribution)