Fig. 4

Representation in the ROC space of paediatric studies. Representation in the ROC space of the studies of PCT for diagnosis of sepsis in paediatric age, divided by cut-off subgroup, and summary sensitivity and specificity points along with their 95% confidence and prediction regions. (ROC, receiver operating characteristic). Legend: PCT paed – cut-off <2 PCT paed – cut-off > 2.5 PCT paed – cut-off =2/2.5