Table 1 Demographic and hemodialysis-related characteristics of participants based on the dietary intake of phosphorus, calcium, magnesium, and phosphorus/protein.

From: Association of dietary minerals and phosphorus to protein ratio with quality of life in Iranian Hemodialysis patients: a cross-sectional study

Variables

Phosphorus intake

Calcium intake

Magnesium intake

Phosphorus/protein

< 700 mg

700–1000 mg

> 1000 mg

P-value 2

< 1000 mg

1000–2000 mg

> 2000 mg

P-value 2

< RDA

> RDA

P-value 3

< median

> median

P-value 3

Sex (% female)

68.2

32.8

12.4

< 0.001

42.5

14.4

3.2

< 0.001

32.9

17.8

0.01

27.3

28.4

0.9

Marital status

   

0.42

   

0.31

  

0.21

  

0.18

Single

20.3

14.5

13.4

 

16

16.3

4.3

 

13.3

19.3

 

18.4

12.2

 

Married

79.7

85.5

86.6

 

84

83.7

95.7

 

86.7

80.7

 

81.6

87.8

 

Age (year)

59.86 ± 14.47

62.39 ± 13.86

56.59 ± 15.71

0.02

60.01 ± 14.60

56.12 ± 15.95

59.20 ± 15.08

0.09

59.73 ± 14.52

55.72 ± 16.39

0.03

57.20 ± 16.08

59.62 ± 14.33

0.15

BMI (kg/m2)

24.90 ± 5.13

24.48 ± 4.34

24.30 ± 4.75

0.73

24.61 ± 4.92

24.41 ± 4.62

23.85 ± 4.21

0.75

24.70 ± 5.02

23.98 ± 4.09

0.21

24.43 ± 4.63

24.49 ± 4.84

0.91

Fat mass (%)

25.75 ± 11.33

23.95 ± 9.24

20.94 ± 9.45

0.01

23.86 ± 10.33

21.40 ± 9.40

19.66 ± 9.41

0.05

23.25 ± 10.10

21.03 ± 9.60

0.08

21.94 ± 10.16

23.03 ± 9.79

0.37

Waist circumference (cm)

95.04 ± 13.63

94.87 ± 12.18

94.86 ± 13.44

0.99

94.83 ± 13.15

95.36 ± 13.11

93.43 ± 14.15

0.77

95.62 ± 13.11

93.46 ± 13.32

0.17

94.50 ± 13.23

95.28 ± 13.20

0.6

Dialysis vintage (weeks)

44.80 ± 40.17

52.10 ± 46.68

46.86 ± 45.83

0.62

47.60 ± 42.70

47.35 ± 39.75

47.55 ± 71.32

0.99

47.94 ± 42.24

46.61 ± 49.87

0.8

46.45 ± 43.46

48.53 ± 46.25

0.68

Dialysis duration (h)

3.91 ± 0.24

3.93 ± 0.20

3.95 ± 0.71

0.88

3.93 ± 0.21

3.98 ± 0.86

3.87 ± 0.28

0.57

3.92 ± 0.24

3.98 ± 0.92

0.35

3.89 ± 0.29

3.99 ± 0.74

0.11

Dialysis frequency (per month)

10.95 ± 2.57

10.93 ± 1.91

10.77 ± 2.67

0.83

11.02 ± 2.33

10.55 ± 2.69

11.03 ± 2.66

0.25

11.07 ± 2.26

10.37 ± 2.90

0.03

10.53 ± 2.77

11.14 ± 2.18

0.02

Kt-V

1.35 ± 0.22

1.37 ± 0.22

1.31 ± 0.23

0.12

1.36 ± 0.22

1.30 ± 0.23

1.28 ± 0.24

0.06

1.33 ± 0.24

1.32 ± 0.21

0.73

1.32 ± 0.21

1.34 ± 0.24

0.38

URR

0.73 ± 0.13

0.72 ± 0.20

0.69 ± 0.11

0.15

0.73 ± 0.16

0.69 ± 0.12

0.66 ± 0.08

0.02

0.72 ± 0.16

0.67 ± 0.07

0.01

0.70 ± 0.13

0.72 ± 0.15

0.27

Phosphorus intake (mg)

525.02 ± 112.04

839.73 ± 80.45

1517.77 ± 516.46

< 0.001

808.97 ± 295.16

1410.63 ± 356.12

2254.77 ± 696.28

< 0.001

894.55 ± 321.73

1757.95 ± 571.19

< 0.001

1188.15 ± 622.93

1173.04 ± 546.44

0.81

Calcium intake (mg)

454.32 ± 153.75

787.73 ± 180.87

1477.26 ± 637.68

< 0.001

655.74 ± 220.22

1403.43 ± 315.05

2599.14 ± 529.21

< 0.001

814.11 ± 360.80

1772.54 ± 678.92

< 0.001

1111.23 ± 677.91

1151.86 ± 654.23

0.58

Magnesium intake (mg)

160.43 ± 40.91

257.51 ± 47.01

440.16 ± 161.16

< 0.001

237.12 ± 85.99

414.38 ± 119.43

665.29 ± 182.51

< 0.001

250.93 ± 80.16

540.36 ± 148.72

< 0.001

351.70 ± 184.96

341.95 ± 162.25

0.61

Phosphorus/protein

17.18 ± 2.17

18.36 ± 2.15

18.01 ± 2.26

0.01

17.62 ± 2.42

18.26 ± 1.97

18.01 ± 2.19

0.05

17.87 ± 2.36

17.97 ± 2.01

0.7

16.14 ± 1.49

19.66 ± 1.30

< 0.001

Energy (Kcal)

944.51 ± 244.95

1340.35 ± 327.12

2290.29 ± 901.33

< 0.001

1333.01 ± 501.99

2179.79 ± 890.90

3066.46 ± 1006.98

< 0.001

1411.28 ± 494.77

2666.45 ± 1015.18

< 0.001

1925.39 ± 1054.82

1729.37 ± 761.98

0.06

  1. 1 Data are expressed as percentage for Qualitative variables and mean ± SD for quantitative variables
  2. 2 Resulted from ANOVA for quantitative variables and chi-square for test for categorical variables.
  3. 3 Resulted from independent t-test for quantitative variables and chi-square test for categorical variables
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