demonstrated good-to-high ROC-AUC values in specifying cases of a SUD. For instance, sensitivity for taking larger amounts was 0.91 for alcohol, indicating that 91% of alcohol users with alcohol abuse or dependence responded affirmatively to this item. Given the consistency across SUDs, these items can be studied further for use as brief screening items for SUDs, as a positive response to one identified a high proportion of individuals with a SUD in this sample. Thus, IRT and ROC-AUC complement one another by demonstrating that poorly performing items are less reliable indicators for a SUD.
