Fig. 1. ROC curve analysis of fecal calprotectin concentrations in Clostridium difficile infection (CDI) cases and healthy controls. (A) The area under the ROC curve (AUC) is 0.746 (95% confidence interval [CI], 0.626-0.866) in severe CDI vs mild CDI; (B) The AUC is 0.821 (95% CI, 0.755-0.887) in CDI vs healthy controls.
