Effect of the Independent Acid Base Variables on Anion Gap Variation in Cardiac Surgical Patients: A Stewart-Figge Approach

Table 3

Output of the multiple linear regression model correlating AG_var (dependent variable) with SIG_var, [Albumin]_var, [Phosphate]_var, PCO_2,var, and SID_a,var (independent variables) (adjusted 𝑅²=0.9999, 𝐹=201890.24, and 𝑃<0.001).

	Unstandardized coefficients; (95% CI)	Standardized coefficients	𝑃 value	Tolerance	VIF
Constant	0 (−0.014, 0.012)		0.883
SIGvar, meq/L	0.934 (0.931, 0.938)	0.948	<0.001	0.310	3.228
[Albumin]var, g/L	0.251 (0.248, 0.253)	0.260	<0.001	0.680	0.1471
[Phosphate]var, mmol/L	1.704 (1.685, 1.723)	0.191	<0.001	0.821	1.218
PCO2,var, mmHg	−0.042 (−0.044, −0.041)	−0.067	<0.001	0.623	1.606
SIDa,var, meq/L	0.065 (0.062, 0.068)	0.071	<0.001	0.283	3.530

CI: confidence intervals.