A point estimate of the AUC of the empirical ROC curve is the Mann-Whitney U estimator (DeLong et al., 1988). The confidence interval for AUC indicates the uncertainty of the estimate and uses the Wald Z large sample normal approximation (DeLong et al., 1988), truncated to lie between 0 and 1. A test with no better accuracy than chance has an AUC of 0.5, a test with perfect accuracy has an AUC of 1.
The interpretation of the AUC is:
AUC can be misleading as it gives equal weight to the full range of sensitivity and specificity values even though a limited range, or specific threshold, may be of practical interest.
From the Statistical Reference Guide for Analyse-it 6.24.0: https://analyse-it.com/docs/user-guide/diagnostic-performance/auc
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