Table 1 Baseline characteristics of the studied groups

Male/females

25/13

19/11

Age, years

64.5 ± 13.2

65.2 ± 11

0.82

Body weight (kg)

65.5 ± 15.1

66.2 ± 11.9

0.73

BMI (kg/m²)

23.7 ± 4.0

25.6 ± 4.13

0.03

Urine volume output (mL/24 h)

1983 ± 651

1472.6 ± 433

<0.001

GFR (mL/min × 1.73 mq b.s)

7.8 ± 1.9

9.2 ± 4.2

<0.01

EPO (IU/kg/week)

104 ± 108

184 ± 84

<0.001

CRP <5 mg/dl, %

89

66.6

<0.01

iPTH, >300 ρg/mL, %

31.5

50

<0.01

Charlson comorbidity index score

5.5 ± 2.5

3.8 ± 2.5

0.004

Charlson comorbidity index score >4, %

62.5

33.3

<0.01