Table 1.
Demographic and biological characteristics of the study population
| Characteristic | Value | Normal Range |
|---|---|---|
| Female/male | 210/481 | |
| Age (yr; mean ± SD [range]) | 60 ± 15 (17 to 88) | |
| GFR (ml/min per 1.73 m2; mean ± SD [range]) | 31.2 ± 13.0 (5.1 to 59.8) | |
| iCa concentration (mmol/L; mean ± SD [range]) | 1.21 ± 0.07 (0.91 to 1.56) | 1.15 to 1.32 |
| Noncorrected tCa concentration (mmol/L; mean ± SD [range]) | 2.22 ± 0.14 (1.71 to 2.73) | 2.10 to 2.53 |
| Albumin-corrected calcium concentration 1 (mmol/L; mean ± SD [range]) | 2.23 ± 0.13 (1.75 to 2.73) | 2.10 to 2.53 |
| Albumin-corrected calcium concentration 2 (mmol/L; mean ± SD [range]) | 2.25 ± 0.13 (1.75 to 2.73) | 2.10 to 2.53 |
| Albumin concentration (g/L; mean ± SD [range]) | 39.6 ± 5.4 (13.3 to 59.0) | 35 to 50 |
| Albumin concentration <35 g/L (frequency [%]) | 108 (16) | |
| Total CO2 concentration (mmol/L; mean ± SD [range]) | 25.1 ± 3.3 (15.2 to 33.6) | 22 to 30 |
| Total CO2 concentration <22 mmol/L (frequency [%]) | 109 (16) | |
| Plasma phosphate concentration (mmol/L; mean ± SD [range]) | 1.14 ± 0.24 (0.56 to 2.70) | 0.82 to 1.40 |