The ROC analysis showed that β-HB and TNF-α adequately discriminated the ALI patients with an AUC of 0.7761 (95% CI 0.68–0.88; p-value <0.0001) and 0.7708 (95% CI 0.68–0.87; p-value <0.0001) (Figure 1D). This evidence concerns the gene TNF and acute respiratory distress syndrome.