Fig. 3: ROC curve analysis for the differential diagnosis of PD from APD.

a ROC curves showing the discrimination between PD and APD (i.e., APD = MSA + PSP/CBS), and (b) AUC value for each assay. ROC curve analysis for the differential diagnosis of (c) PD vs MSA, and (d) PD vs PSP/CBS. APD atypical parkinsonian disorder, AUC area under the curve, CSF cerebrospinal fluid, MSA multiple system atrophy, PD Parkinson’s disease, PSP/CBS progressive supranuclear palsy/corticobasal syndrome, ROC receiver operating characteristic.