Table 4.

Logistic regression analysis of the association between minimal COHb level and ICU mortality

	Odds ratio and 95% confidence intervals	P-value
COHb minimum, %	0.6 (0.4 to 0.8)	0.001
SAPSII score	1.0 (1.0 to 1.0)	< 0.001
Cardiovascular failure on ICU admission, yes/no	2.2 (1.6 to 3.3)	< 0.001
Renal failure on ICU admission, yes/no	1.8 (1.2 to 2.6)	0.003
Hepatic failure on ICU admission, yes/no	1.8 (1.2 to 2.7)	0.003

SAPS II score and the type of organ failure on admission were predefined confounders.