Death was found to be directly associated with several factors: the need for ventilation (OR 6.9, IC 95% 4.3–11.1), having advanced age (OR 3.5, IC 95% 2.6–4.7), ICU admission (OR 3.2, IC 95% 1.8–5.6), neuromuscular disorders (OR 2.9, IC 95% 1.2–2.9), thrombocytopenia (OR 2.2, IC 95% 1.4–3.6), elevated prothrombin time (OR 2.1, IC 95% 1.2–3.3), hypoalbuminemia (OR 2.1, IC 95% 1.3–3.2), dementia (OR 2.0, IC 95% 1.1–3.6), cancer (OR 1.9, IC 95% 1.0–3.4), elevated CPK (OR 1.9, IC 95% 1.2–2.9), and neutrophilia (OR 1.8, IC 95% 1.1–2.9). The gene discussed is PIK3C2A; the disease is dementia.