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Receiver operating characteristic curves comparing procalcitonin (AUC 0.741), CRP (AUC 0.567), WBC (AUC 0.644) for prediction of severe community-acquired pneumonia defined as CURB-65≥II in the elderly CAP patients (≥65 years). AUC: area under the curve; CRP: C-reactive protein; WBC: white blood cell; CAP: community-acquired pneumonia; PCT: procalcitonin.
