Table 6.
Predictors and risk of under- or overestimation of iCa by albumin-corrected tCa, formula 2: Univariate and multivariate logistic regression analysisa
| Parameter | Underestimation
|
Overestimation
|
||
|---|---|---|---|---|
| Univariate Analysis (OR [95% CI]) | Multivariate Analysis (OR [95% CI]) | Univariate Analysis (OR [95% CI]) | Multivariate Analysis (OR [95% CI]) | |
| Age (by 10 yr) | 0.91 (0.77 to 1.08) | 0.91 (0.70 to 1.18) | 1.23 (1.04 to 1.45) | 1.05 (0.56 to 1.98) |
| Albumin (g/L) | 1.04 (0.98 to 1.10) | 1.07 (0.89 to 1.18) | 0.88 (0.85 to 0.92)b | 0.73 (0.61 to 0.88)b |
| tCO2 (mmol/L) | 0.81 (0.75 to 0.89)b | 0.74 (0.64 to 0.85)b | 1.00 (0.94 to 1.08) | 1.42 (1.01 to 2.00) |
| GFR (ml/min per 1.73 m2) | 0.98 (0.96 to 1.00)b | 1.01 (0.98 to 1.05) | 0.96 (0.91 to 1.02) | 0.93 (0.87 to 1.00) |
a
tCa value was corrected by formula 2 only in patients with plasma albumin concentration <35 g/L; in patients with plasma albumin concentration ≥35 g/L, the measured, noncorrected value was used in the analysis.
b
P < 0.05.