Table 5.
Predictors and risk of under or overestimation of iCa by albumin-corrected tCa, formula 1: 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) | 0.87 (0.74 to 1.01) | 0.89 (0.69 to 1.15) | 1.20 (1.00 to 1.42) | 1.10 (0.56 to 2.16) |
| Albumin (g/L) | 0.98 (0.93 to 1.02) | 1.04 (0.95 to 1.13) | 0.91 (0.87 to 0.95)b | 0.75 (0.63 to 0.90)b |
| tCO2 (mmol/L) | 0.79 (0.73 to 0.86)b | 0.72 (0.62 to 0.83)b | 0.99 (0.92 to 1.08) | 1.34 (0.95 to 1.91) |
| GFR (ml/min per 1.73 m2) | 0.98 (0.96 to 1.00)b | 1.02 (0.99 to 1.05) | 0.97 (0.91 to 1.03) | 0.94 (0.88 to 1.10) |
a
tCa value was corrected by formula 1 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.