Table 3.

Multivariate analysis with Cox model for 3-month mortality-associated factor.

	Hazard ratio	95% CI	P value
Significant covariables
AST >68 IU/L	7.68	1.68-35.1	<.01
Creatinine >96 µmol/L	4.73	1.61-13.92	<.01
Non-significant variable included in segmentation tree
P/F ⩽110	1.36	0.47-3.92	.57

Abbreviations: AST, alanine aminotransferase; CI, confidence interval; P/F, O₂ partial pressure/O₂ inspired fraction ratio.

A value of P < .05 was considered statistically significant.