PRTN3 and peeling skin syndrome: ROC curve statistics showing sensitivity, specificity, +LR/−LR for one, two, or three AAPA reactivities in different scenarios (eRA versus healthy controls, estRA versus healthy controls, eRA versus SpA, eRA versus OIRD (namely SLE, pSS, myositis, GPA), RF/ACPA negative eRA versus healthy, RF/ACPA negative eRA versus SpA, RF/ACPA negative eRA versus OIRD), including AUC values.