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ROC for alive/dead dichotomized outcome: IMPACT Core, Core + mean ICP, Core + % time PRx >+0.35, and Core + mean ICP + % time PRx >0.35. (A) IMPACT Core variables alone. (B) IMPACT Core + mean ICP. (C) IMPACT Core + % time with PRx >+0.35. (D) IMPACT Core + mean ICP + % time with PRx >+0.35. ICP, intracranial pressure; MAP, mean arterial pressure; mICP, mean ICP; PRx, pressure reactivity index (correlation between ICP and MAP); AUC, area under the curve; ROC, receiver operating curve.
