CYGB and susceptibility to pneumonia measurement: In model 1, patients with elevated HGB had increased incidences of stress ulcer bleeding (OR 1.80, 95%CI 1.02–3.19, p = 0.043), pneumonia (OR 2.38, 95%CI 1.41–4.04, p < 0.001), DVT (OR 2.90, 95%CI 1.45–5.78, p = 0.002), and unfavorable outcomes at 90 days (OR 2.21, 95%CI 1.22–4.00, p = 0.009), compared to patients with standard HGB.