Descriptive statistics (data reported as median [range]) were
calculated using GraphPad InStat. Paediatric Index of Mortality 2
(PIM2) Scores were calculated using the following parameters:
systolic blood pressure (mm Hg), papillary reaction to bright light,
PaO2 (mm Hg), base excess (mmol/L), and mechanical ventilation at
any time during the first hour in the intensive care unit, type of
admission and whether the diagnosis was high or low risk [