Central venous-to-arterial carbon dioxide difference as a prognostic tool in high-risk surgical patients

Table 4 Logistic regression results: variables associated with the occurrence of postoperative complications

	B (SE)	Odds ratio	95% confidence interval	P
Constant	−5.61 (3.50)
PCO₂ gap	0.66 (0.18)	1.93	1.36-2.75	<0.001
SOFA score	0.42 (0.15)	1.52	1.14-2.02	0.004
Lactate	0.38 (0.37)	1.47	0.71-3.02	0.300
SAPS II score	0.04 (0.04)	1.04	0.96-1.13	0.347
Emergency surgery	0.09 (1.17)	1.10	0.11-10.80	0.937
Bicarbonate	−0.07 (0.11)	0.931	0.75-1.16	0.931
Troponin	1.87 (1.47)	6.50	0.36-117.06	0.204
diuresis	0.0003 (0.002)	1.00	0.997-1.003	0.825

Model χ² = 54.96, P < 0.001, R² = 0.50 (Hosmer and Lemeshow), R² = 0.48 (Cox and Snell), R² = 0.66 (Nagelkerke). Significant P values are indicated in bold text. PCO₂ gap, central venous-to-arterial difference in carbon dioxide; SAPS II, Simplified Acute Physiology Score II; SE, standard error; SOFA, Sequential Organ Failure Assessment.

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