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A total of 32 individuals with severe traumatic brain injury underwent interdisciplinary rehabilitation evaluations at admission to and discharge from an inpatient rehabilitation program. The relationships of medical and psychological factors at admission to length of rehabilitation stay and adaptive physical functioning (APF) at discharge were explored through correlational analyses. Results suggest that the actual status of APF at discharge is related to initial assessments of medical, not psychological, factors. However, psychological factors were related to relative improvement in APF when change occurred. Length of rehabilitation stay was determined by both physical and psychological functioning.