a trend toward significancep = 0.092
These included a lower PaO 2 /FiO 2 ratio (OR = 0.989; 95% CI: 0.985–0.994; p < 0.001), systolic blood pressure (OR = 0.976; 95% CI: 0.960–0.991; p = 0.003), reduced hemoglobin concentration (OR = 0.735; 95% CI: 0.602–0.897; p = 0.002), the presence of acute confusion (OR = 4.984; 95% CI: 2.067–12.019; p < 0.001), Alzheimer’s dementia (OR = 2.362; 95% CI: 1.037–5.380; p = 0.041), and a trend toward significance for serum sodium level (serum sodium mmol/L; OR = 1.050; 95% CI: 0.992–1.112; p = 0.092).