Table 1 Baseline characteristics of patients in each of the S1-somatic score tertile group (n = 320)

S1 score

1.51 ± 0.39

1.09 ± 0.06

1.40 ± 0.13

1.95 ± 0.30

Age, years

58.60 ± 14.2

57.52 ± 16.54

56.90 ± 13.35

61.80 ± 19.11

0.89

 Male

120 (37.50%)

46 (42.20%)

40 (35.08%)

34 (35.05%)

0.76

 Female

200 (62.50%)

63 (57.79%)

74 (64.91%)

63 (64.94%)

0.81

Dialysis duration, years

2.13 ± 1.19

1.89 ± 1.14

2.21 ± 1.23

1.82 ± 1.24

0.88

BMI, kg/m2

21.33 ± 5.12

20.46 ± 5.31

21.22 ± 5.43

22.41 ± 4.43

0.51

 Chronic glomerulonephritis

184 (57.50%)

58 (53.21%)

69 (60.53%)

57 (58.76%)

 Diabetic nephropathy

88 (27.50%)

30 (27.52%)

29 (25.44%)

29 (29.90%)

 Hypertensive nephropathy

11 (3.44%)

4 (3.67%)

4 (3.51%)

3 (3.09%)

 Other or unknown

37 (11.56%)

17 (15.60%)

12 (10.53%)

8 (8.25%)

 TSF, mm

6.75 [5.00–9.00]

10.00 [9.00–12.88]

6.25 [6.00–7.13]

4.00 [4.00–4.38]

P < 0.001^#

 MAMC, mm

24.58 ± 3.06

27.85 ± 1.87

24.35 ± 0.63

21.19 ± 1.70

P < 0.001^#

 Grip strength, N

26.50 [20.60–34.25]

36.35 [33.15–38.93]

25.95 [24.10–27.73]

17.40 [10.60–19.30]

P < 0.001^#

 5-m walking time (s)

5.00 [4.07–6.00]

4.00 [4.00–4.25]

5.00 [5.00–5.31]

6.58 [6.00–9.83]

P < 0.001^#

 30 s Sit-to-stand test

16.50 [13.00–20.00]

20.50 [20.00–22.00]

16.00 [15.00–17.00]

11.50 [9.00–13.00]

P < 0.001^#

 IPAQ-C (MET-min/week)

3251.43 ± 4000.49

5348.20 ± 4844.82

2798.31 ± 3583.50

1132.95 ± 1458.38

P < 0.001^#

 Total

3725.92 ± 2663.47

6564.83 ± 2426.82

3217.42 ± 579.50

1151.25 ± 661.75

P < 0.001^#

 Dialysis day

3218.08 ± 2264.80

5242.77 ± 2498.89

2865.43 ± 918.89

1370.08 ± 929.61

P < 0.001^#

 Non-dialysis day

4367.31 ± 3606.56

8151.58 ± 3158.02

3702.37 ± 1498.03

920.10 ± 809.94

P < 0.001^#

UC, %

0.69 [0.64–0.74]

0.68 [0.63–0.72]

0.69 [0.66–0.74]

0.70 [0.67–0.76]

0.463

 iPTH, pg/ml

319.60 [154.75–591.75]

338.20 [162.68–628.75]

251.00 [148.00–454.25]

355.50 [155.00–595.25]

0.29

 Ca, mmol/L

2.14 ± 0.25

2.15 ± 0.25

2.14 ± 0.25

2.14 ± 0.26

0.598

 P, mmol/L

38.35 [36.10–40.40]

41.80 [40.00–43.08]

38.40 [36.70–39.03]

35.65 [33.25–36.50]

0.946

 K, mmol/L

5.09 ± 0.95

5.01 ± 0.97

4.93 ± 0.85

5.36 ± 1.01

0.527

 Mg, mmol/L

1.04 ± 0.15

1.02 ± 0.11

1.02 ± 0.14

1.08 ± 0.18

0.83

 LC, 10^9/L

6.00 [4.78–6.99]

4.57 [3.85–5.00]

5.95 [5.45–6.52]

7.28 [6.52–8.17]

P < 0.001^#

 NC, 10^9/L

4.00 [3.28–5.00]

4.10 [3.53–5.15]

3.60 [3.00–4.45]

4.10 [3.53–5.38]

0.512

 hsCRP, mg/L

1.50 [0.50–4.50]

0.50 [0.00–0.50]

1.40 [0.90–3.10]

6.00 [3.13–12.85]

P < 0.001^#

 HB, g/L

106.34 ± 14.40

107.89 ± 16.39

102.70 ± 11.75

108.88 ± 14.40

0.131

 SI, μmol/L

11.80 [8.90–14.85]

12.65 [10.00–15.05]

11.20 [7.70–16.20]

11.60 [9.20–13.40]

0.203

 Tfs, %

26.75 [18.53–34.50]

27.25 [21.85–36.40]

26.50 [15.85–35.60]

26.30 [22.60–31.80]

0.249

 SF, μg/L

280.63 ± 257.34

293.78 ± 291.50

335.02 ± 265.10

199.57 ± 181.82

0.075

 BPC, 10^9/L

176.29 ± 63.54

173.82 ± 57.04

166.60 ± 49.65

190.44 ± 81.79

0.265

 Alb, g/L

38.31 ± 5.78

42.89 ± 4.54

38.16 ± 0.89

33.37 ± 6.25

P < 0.001^#

 TC, mmol/L

4.35 ± 1.15

4.37 ± 1.23

4.36 ± 1.01

4.32 ± 1.25

0.785

 TG, mmol/L

2.25 ± 1.59

2.06 ± 1.55

2.06 ± 1.32

2.68 ± 1.88

0.254

 LDL, mmol/L

2.35 ± 0.90

2.35 ± 0.77

2.49 ± 0.96

2.17 ± 0.94

0.192