Table 3.
Patient characteristics by serum calcium categories.
| Parameters | <2.10 mmol/L (n = 31) | 2.10–2.37 mmol/L (n = 92) | 2.38–2.75 mmol/L (n = 57) | >2.75 mmol/L (n = 33) | P-value |
|---|---|---|---|---|---|
| Age (years) | 50.9 ± 15.0 | 52.9 ± 15.0 | 58.3 ± 16.4 | 56.5 ± 26.1 | 0.09 |
| Systolic Bp (mmHg) | 130.9 ± 18.6 | 138.8 ± 21.5 | 139.8 ± 30.7 | 138.9 ± 21.5 | 0.18 |
| Diastolic Bp (mmHg) | 71.2 ± 15.3 | 71.7 ± 11.2 | 76.4 ± 18.9 | 71.2 ± 11.1 | 0.38 |
| Haemoglobin (g/dL) | 10.8 ± 2.4 | 10.2 ± 1.9 | 10.1 ± 1.9 | 8.15 ± 1.9 | 0.20 |
| Albumin g/L | 32.0 ± 5.2 | 32.7 ± 6.0 | 30.5 ± 6.6 | 29.5 ± 5.0 | 0.26 |
| T.chol (mmol/L) | 4.3 ± 1.0 | 4.2 ± 0.9 | 4.2 ± 0.9 | 4.1 ± 0.9 | 0.97 |
| 25-OH vitamin D (ng/mL) | 22.8 ± 9.1 | 22.0 ± 10.4 | 18.1 ± 8.1 | 15.8 ± 3.5 | 0.11 |
| PTH (pg/mL) | 568.8 ± 334.8 | 458.64 ± 424.4 | 366.2 ± 405.1 | 254.0 ± 103.2 | 0.01 |
| Phosphate (mmol/L) | 1.5 ± 0.6 | 1.6 ± 0.6 | 1.5 ± 0.5 | 1.6 ± 0.5 | 0.66 |
| Creatinine(μmol/L) | 822.5 ± 261.0 | 734.4 ± 283.2 | 592.5 ± 245.5 | 489.5 ± 355.7 | 0.002 |
| Kt/V | 1.4 ± 0.2 | 1.5 ± 0.3 | 1.4 ± 0.3 | 1.4 ± 0.4 | 0.33 |
| Dialysis vintage (months) | 31.3 ± 23.0 | 34.2 ± 23.0 | 30.9 ± 21.1 | 30.0 ± 8.9 | 0.80 |
| Dialysate calcium (mmol/L) | 1.65 ± 0.24 | 1.63 ± 0.14 | 1.63 ± 0.14 | 1.54 ± 0.24 | 0.50 |
| DM, n | 13 | 15 | 17 | 11 | 0.40 |
| Medications | |||||
| Calcium carbonate n (%) | 30 (96.8%) | 79 (85.7%) | 41 (71.9%) | 13 (39.4%) | <0.001 |
| Alfacalcidol n (%) | 28 (90.3%) | 63 (68.4%) | 35 (61.4%) | 11 (33.3%) | <0.001 |
Continuous variables are presented as means ± standard deviations or median (interquartile range) and categorical data as frequencies (percentages). BP = blood pressure, PTH = parathyroid hormone, P values derived by one-way ANOVA, and Kruskal-Wallis tests for continuous variables and Chi-squared for categorical variables. Serum categories based on KDOQI reference range.