ROC curve for α-synuclein levels in iPD patients.

<p>A receiver operating characteristic (ROC) curve was generated for total α-synuclein in iPD patients. The dashed reference line represents the ROC curve for a test with no discriminatory ability. The area under the ROC curve (AUC) is displayed on the graph with the 95% confidence interval shown between the parentheses (0.524–0.667). The level of significance was set at <i>p</i><0.05. No possible cutoff value was derived from the analysis.