Population-level plot of top contributing factors to the increase in model risk score. The x-axis represents hours prior to onset time of mechanical ventilation. The y-axis represents the top factors (sorted by the magnitude of relevance score) across the patient populations at the (A) UCSD cohort and (B) MIMIC cohort. Resp rate = respiratory rate; HR = heart rate; Lymphocytes diff = lymphocyte differential count; BUN = blood urea nitrogen; O₂Sat = oxygen saturation; WBC = white blood count; AST = aspartate aminotransferase; RDW = red blood cell distribution width; PaO₂ = partial pressure of oxygen; PTT = partial thromboplastin time; PaCO₂ = partial pressure of carbon dioxide; FiO₂ = fraction of inspired oxygen.