Serum procalcitonin (PCT) level (
. A), white blood cells count (WBC) (
. B) and C-reactive protein (CRP) level (
. C), at the onset of blood stream infection according to its primary (
= 127) or secondary status (
= 62) in critically ill patients with clinical sepsis. Data are presented as box plots with median lines, 25- and 75-percentile boxes, and 10- and 90-percentile error bars. The circles represent the outliers. A log scale is used for the Y-axis in Fig. A. * indicate p < 0.05 between primary and secondary sepsis.