Clinical characteristics significantly correlated with 30-day mortality were bedridden status (34.2% vs 58.9%, p = 0.009), presence of tachypnea (17.1% vs 35.5%, p = 0.04), delirium (41.5% vs 68.6%, p = 0.002), and low hemoglobin and albumin serum levels (12.1 vs 11.1 g/dl, p = 0.02 and 2.8 vs 2.4 g/dl, p = 0.004, respectively). This evidence concerns the gene ALB and delirium.