Fig. 1: Top 20 most important concepts selected by the Chi-squared statistic for the RF algorithm for ITU admission prediction.

The selected features align with our statistical analysis, emphasising the significance of neurovascular, neuro-oncological, infection and musculoskeletal concepts for ITU / ward patients. Note that Battery stands for VNS (vagus nerve stimulation) battery, and EVD refers to the external ventricular drain.