The receiver operating characteristic curve for the performance of the Bedside Paediatric Early Warning System score. Data are presented for 2,074 patients who were admitted to inpatient wards of four university-affiliated paediatric hospitals in a frequency-matched case-control study with two control patients per case. Case patients had either an immediate call to a resuscitation team or were urgently admitted to a paediatric intensive care unit (PICU) without a call to the resuscitation team. Control patients had neither. The maximum Bedside Paediatric Early Warning System score was calculated for the 12 hours ending 1 hour before the resuscitation team call or urgent PICU admission in case patients and for 12 hours in control patients.