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Survival curves for subjects in the EEG guidance and usual care groups. Inset: survival curves for the first 90 days in greater detail. In a Cox proportional hazards model, the hazard for death did not differ significantly between the EEG-guided group and the usual care group (adjusted hazard ratio=0.85; 99.5% confidence interval, 0.51–1.44; P=0.39).
