Fig. 2From: Ability of procalcitonin to distinguish between bacterial and nonbacterial infection in severe acute exacerbation of chronic obstructive pulmonary syndrome in the ICUReceiver operating characteristic (ROC) curves at any time (i.e., H0, H6 and H24 after inclusion) for the prediction of documented bacterial infection (including bacterial and viral coinfection) (BAC + group) vs nondocumented bacterial infection (i.e., documented viral infection alone or absence of documented pathogen) (BAC− group) for the PCT levelsBack to article page