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Table 3 Odds ratio (ORs) and 95% CIs for post-dialysis fatigue by the corrected serum calcium levels stratified by age

From: Association between corrected serum calcium levels after dialysis and post-dialysis fatigue risk: a hospital-based case–control study

Total calcium, mmol/l

Fatigue (N = 340)

Non-fatigue (N = 270)

Model1a OR (95% CI)

Model2b OR (95% CI)

Model3c OR (95% CI)

P interaction

< 65

      

 T1 (< 2.35)

61

67

1.00 (ref)

1.00 (ref)

1.00 (ref)

 

 T2 (2.35–2.47)

81

67

1.33 (0.83–2.14)

1.31 (0.81–2.11)

1.16 (0.69–1.95)

 

 T3 (> 2.47)

88

69

1.40 (0.88–2.24)

1.36(0.85-2.19)

1.09 (0.63–1.89)

 

 P trend

  

0.164

0.209

0.776

0.047

 ≥ 65

      

 T1 (< 2.32)

20

22

1.00 (ref)

1.00 (ref)

1.00 (ref)

 

 T2 (2.32–2.39)

26

22

1.30 (0.57–3.00)

1.23 (0.53–2.87)

1.84 (0.70–5.03)

 

 T3 (> 2.39)

64

23

3.06 (1.42–6.69)

2.86 (1.32–6.32)

4.25 (1.66–11.46)

 

 P trend

  

0.002

0.005

0.003

 
  1. CI, confidence interval; OR, odds ratio; T, tertiles; ref, reference
  2. aModel 1: Crude model
  3. bModel 2: Adjusted for gender and dialysis age
  4. cModel 3: Adjusted for gender, dialysis age, body mass index, residual kidney function, hemoglobin, albumin, urea nitrogen, single-pool Kt/Vurea, C-reactive protein, phosphorus, hypertension, diabetes and daily exercise time