Fig. 6

ROC-curve for sensitivity and specificity in determining the origin of prednisolone using the prednisolone/cortisol ratio. Data for natural stress (slaughter, n = 36), pharmacologically induced stress (ACTH, n = 45), and exogenously administered prednisolone (PO and IM, n = 103) were used for establishing the ROC-curve. The diagonal line represents the class discrimination on random chance with an AUC of 0.5 whereas a perfect discrimination is represented by an AUC of 1. The AUC of this particular ROC curve was 0.945