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Box plot of T Score for Cognitive Function health-related quality of life (HRQoL) at three months, stratified by prophylactic levetiracetam (white) or no prophylactic levetiracetam (shaded). Prophylactic levetiracetam was associated with lower HRQoL, regardless of severity of injury (ICH Score). There were too few patients with ICH Scores of >2 to construct boxes.
