Table 2.

Univariable and multivariable linear regression models to identify predictors of plasma total calcium concentration in azotemic and nonazotemic cats with underestimated ionized calcium concentration

	Univariable Results		Multivariable Results
	β (95% CI)	P	β (95% CI)	P
CKD cats (n = 171)
Ionized calcium (mg/dL)	1.89 (1.65–2.13)	<.001	1.74 (1.50–1.97)	<.001
HCO3 − (mEq/L)	0.08 (0.03–0.13)	.002	0.06 (0.03–0.09)	<.001
Creatinine (mg/dL)	0.30 (0.09–0.51)	.005	0.23 (0.09–0.38)	.001
Albumin (g/dL)	0.62 (0.15–1.09)	.010	0.48 (0.17–0.78)	.002
Nonazotemic cats (n = 99)
Ionized calcium (mg/dL)	2.03 (1.71–2.35)	<.001	1.92 (1.66–2.19)	<.001
Albumin (g/dL)	0.87 (0.49–1.26)	<.001	0.68 (0.47–0.89)	<.001
HCO3 − (mEq/L)	0.05 (0.00–0.11)	.065	0.04 (0.02–0.07)	.002
Creatinine (mg/dL)	0.52 (0.02–1.02)	.042

CKD, chronic kidney disease; β, regression coefficient; 95% CI, 95% confidence interval; HCO₃ ⁻, venous bicarbonate; P, significance.