Table 1 Baseline characteristics of the 169 PD patients in our study cohort
Variable | No. of Missing Value (%) | Whole patients | iCa/cCa ratio | P value | ||
|---|---|---|---|---|---|---|
< 47.0% | 47.0 to < 49.0% | ≥49.0% | ||||
Number | 0 (0) | 169 | 56 (33%) | 54 (32%) | 59 (35%) | Â |
Male [%] | 0 (0) | 124 (73%) | 40 (71%) | 37 (69%) | 47 (80%) | 0.38 |
Age [y] | 0 (0) | 62 ± 13 | 63 ± 13 | 61 ± 14 | 61 ± 14 | 0.56 |
PD duration [months] | 0 (0) | 24 (11–50) | 32 (12–74) | 24 (12–44) | 18 (9–40) | 0.04 |
BMI [kg/m2] | 0 (0) | 23.7 ± 4.3 | 22.9 ± 4.1 | 23.8 ± 4.8 | 24.5 ± 4.0 | 0.14 |
Underlying disease | Â | Â | Â | Â | Â | 0.89 |
 CGN [%] | 0 (0) | 50 (30%) | 16 (28%) | 18 (33%) | 16 (27%) |  |
 Diabetes [%] | 0 (0) | 61 (36%) | 21 (38%) | 21 (39%) | 19 (32%) |  |
 Nephrosclerosis [%] | 0 (0) | 29 (17%) | 11 (20%) | 6 (11%) | 12 (20%) |  |
 PCKD [%] | 0 (0) | 6 (4%) | 1 (2%) | 2 (4%) | 3 (5%) |  |
 Others or unknown [%] | 0 (0) | 23 (14%) | 7 (13%) | 7 (13%) | 9 (15%) |  |
Comorbidity | ||||||
 CVD [%] | 0 (0) | 52 (31%) | 19 (34%) | 22 (41%) | 11 (19%) | 0.03 |
Residual renal function | ||||||
 Urine volume [ml] | 25 (14.8) | 700 (300–1500) | 500 (200–1080) | 600 (190–1420) | 900 (540–1730) | 0.01 |
 Weekly renal Kt/V | 49 (29.0) | 0.46 (0.14–0.83) | 0.25 (0.09–0.61) | 0.43 (0.12–0.73) | 0.66 (0.40–1.00) | < 0.01 |
PD solution | ||||||
 Dialysate Volume [L] | 0 (0) | 5.8 ± 1.8 | 6.3 ± 1.5 | 5.7 ± 1.9 | 5.5 ± 1.9 | 0.045 |
Medication | ||||||
 Cinacalcet [%] | 0 (0) | 47 (28%) | 23 (41%) | 13 (24%) | 11 (19%) | 0.02 |
 Vitamin D [%] | 0 (0) | 91 (54%) | 27 (48%) | 29 (54%) | 35 (59%) | 0.49 |
 Ca-containing P binder [%] | 0 (0) | 47 (28%) | 23 (41%) | 10 (19%) | 14 (24%) | 0.02 |
 Ca-free P binder [%] | 0 (0) | 86 (51%) | 26 (46%) | 37 (69%) | 23 (39%) | < 0.01 |
Laboratory data | ||||||
 pH | 0 (0) | 7.34 ± 0.04 | 7.366 ± 0.033 | 7.339 ± 0.005 | 7.328 ± 0.005 | < 0.01 |
 Bicarbonate [mmol/L] | 0 (0) | 24.8 ± 2.5 | 25.3 ± 2.5 | 24.7 ± 2.3 | 24.3 ± 2.5 | 0.08 |
 Hemoglobin [g/dL] | 2 (1.2) | 11.2 ± 1.3 | 10.8 ± 1.5 | 11.1 ± 1.1 | 11.6 ± 1.2 | < 0.01 |
 Creatinine [mg/dL] | 0 (0) | 10.4 ± 3.2 | 10.7 ± 2.8 | 11.1 ± 3.6 | 9.6 ± 2.9 | 0.04 |
 Albumin [g/dL] | 0 (0) | 3.3 ± 0.5 | 2.9 ± 0.4 | 3.4 ± 0.5 | 3.5 ± 0.3 | < 0.01 |
 Phosphorus [mg/dL] | 0 (0) | 5.4 ± 1.3 | 5.4 ± 1.2 | 5.5 ± 1.6 | 5.4 ± 1.0 | 0.84 |
 Total Ca [mg/dL] | 0 (0) | 8.7 ± 0.7 | 8.5 ± 0.7 | 8.6 ± 0.6 | 8.9 ± 0.6 | < 0.01 |
 cCa [mg/dL] | 0 (0) | 9.4 ± 0.7 | 9.6 ± 0.8 | 9.3 ± 0.6 | 9.3 ± 0.6 | 0.02 |
 iCa [mmol/L] | 0 (0) | 1.13 ± 0.09 | 1.09 ± 0.09 | 1.12 ± 0.07 | 1.18 ± 0.07 | < 0.01 |
 aiCa [mg/dL] | 0 (0) | 4.5 ± 0.4 | 4.6 ± 0.3 | 4.4 ± 0.4 | 4.4 ± 0.4 | < 0.01 |
 iCa/cCa ratio [%] | 0 (0) | 48.2 ± 2.5 | 45.4 ± 1.5 | 48.1 ± 0.6 | 50.7 ± 1.4 | < 0.01 |
 Intact PTH [pg/dL] | 0 (0) | 176 (103–255) | 180 (111–269) | 177 (121–264) | 151 (85–233) | 0.54 |
 CRP [mg/dL] | 0 (0) | 0.12 (0.05–0.36) | 0.22 (0.05–0.43) | 0.12 (0.05–0.32) | 0.08 (0.04–0.23) | 0.06 |