In Fig. 4, the cut-off values of group 2 are PCT 0.89–1.64 (not 0.89–1.16) and the cut-off values of group 3 are PCT 1.64–9.33 (not 1.16–9.33). The rest of the results are correct, including number and percentages of the different groups (see Fig. 1). This error does not affect the significance of the results or the validity of the comments in the discussion. The authors regret their mistake.

Fig. 1
figure 1

Cut-off values of the five procalcitonin groups and percentage of SIRS groups, according to the definitions of the American College of Chest Physicians/Society of Critical Care Medicine [6], modified for use in paediatrics [3, 7], correctly classified in each group