Table 1 Sociodemographic and clinical characteristics and therapeutic data of participants (n = 94)

Sociodemographic characteristics

 Gender^a, n (%)

-0.267

  Male

56 (59.6)

21 (80.8

35 (51.5)

0.010*

  Female

38 (40.4)

5 (19.2)

33 (48.5)

 Age, mean ± SD,years

49.73 ± 15.88

46.33 ± 18.95

50.49 ± 15.17

-0.262

0.437

 Smoking^a, n (%)

0.114

  Never

80 (85.1)

21 (80.8)

59 (86.8)

0.543

  Former smoker

13 (13.8)

5 (19.2)

8 (11.8)

  Current smoker

1 (1.1)

0

1 (1.5)

 Level of education^a, n (%)

0.310

  Not educated

9 (9.6)

0

9 (13.2)

0.108

  Low School

7 (7.4)

1 (3.8)

6 (8.8)

  Middle School

27 (28.7)

12 (46.2)

15 (22.1)

  High School

37 (39.4)

9 (34.6)

28 (41.2)

  College degree

12 (12.8)

4 (15.4)

8 (11.8)

  Post-graduate

2 (2.1)

0

2 (2.9)

 Occupation^a, n (%)

0.282

  Not employed

51 (54.3)

18 (69.2)

33 (48.5)

0.058

  Employed

19 (20.2)

6 (23.1)

13 (19.1)

  Retired

9 (9.6)

2 (7.7)

7 (10.3)

  Not able to work due to disability

15 (16)

0

15 (22.1)

 Active lifestyle^a, n (%)

40 (42.6)

14 (53.8)

26 (38.2)

-0.141

0.171

 Socioeconomic status^a, n (%)

0.234

  Low

48 (51.1)

18 (69.2)

30 (44.1)

0.076

  Average

43 (45.7)

7 (26.9)

36 (52.9)

  High

3 (3.2)

1 (3.8)

2 (2.9)

Anthropometric measures

 Weight, mean ± SD,Kg

78.93 ± 19.03

72.64 ± 20.27

80.27 ± 18.64

-0.403

0.212

 Height, mean ± SD,m

1.67 ± 0.09

1.69 ± 0.09

1.65 ± 0.09

0.246

0.398

 BMI, mean ± SD,Kg/m²

28.24 ± 6.54

25.26 ± 5.61

29.83 ± 6.58

-0.562

0.081

Clinical characteristics

 Duration of hemodialysis,median (min–max),years

3.1 (0.25–22)

1.5 (0.5–13)

4 (0.25–22)

0.204

0.067

 Associated comorbidities, n (%)

  Diabetes mellitus^b

10 (10.6)

1 (3.8)

9 (13.2)

0.136

0.275

  Hypertension^a

49 (52.1)

5 (19.2)

44 (64.7)

0.407

 < 0.001*

  Ischemic heart disease^a

7 (7.4)

1 (3.8)

6 (8.8)

0.085

0.669

Therapeutic data, n (%)

 Erythropoitin

59 (62.8)

7 (26.9)

52 (76.5)

0.458

 < 0.001*

 Calcium supplementation^a

47 (50)

7 (26.9)

40 (58.8)

0.285

 < 0.006*

 Iron supplementation^a

39 (41.5)

5 (19.2)

34 (50)

0.279

 < 0.007*

 Antihypertensives^b

41 (43.6)

4 (15.4)

37 (54.4)

0.352

 < 0.001*

 Antidiabetics^b

9 (9.6)

1 (3.8)

8 (11.8)

0.120

0.436

Laboratory data

 HB ^c, mean ± SD, g/dL

10.94 ± 1.43

10.46 ± 1.33

11.08 ± 1.44

-0.441

0.081

 Ferritin^d, median (min–max), ng/mL

275.5 (12.4–1730)

316.3 (21.9–848.4)

270.2 (12.4–1730)

0.031

0.777

 TSAT^d, median (min–max),%

21 (5–59)

21 (5–56)

21 (7–59)

0.069

0.525

 Serum albumin^c mean ± SD, g/dL

3.91 ± 0.35

3.88 ± 0.41

3.92 ± 0.34

0.061

0.567

 Ca^c mean ± SD, mg/dL

8.37 ± .872

8.47 ± 0.57

8.34 ± 0.95

-0.112

0.435

 PO4^d median (min–max), mg/dL

5.1 (1.9–10.7)

5 (10–10.7)

5.6 (2–10.2)

0.103

0.339

 PTH^d median (min–max), pg/mL

401 (4.6–1978)

422 (36.9–1467)

397 (4.6–1978)

0.056

0.605

 Urea reduction ratio (URR)

60.66 ± 11.49

59.84 ± 9.04

60.92 ± 12.21

-0.093

0.711

 Kt/v URR

1.23 ± 0.45

1.19 ± 0.36

1.24 ± 0.48

-0.092

0.713

 Kt/v Duagirdas

1.18 ± 0.41

1.13 ± 0.30

1.19 ± .44

-0.157

0.533