Figure 2. Receiver operating characteristic curves for the Survey of Autonomic Symptoms (SAS) symptom score, total symptom impact score (TIS), and Autonomic Symptom Profile (ASP).

(A) SAS, (B) TIS, (C) ASP. The SAS symptom score (area under the curve = 0.828) shows a slightly greater sensitivity and specificity compared to the ASP (area under the curve = 0.812) but this was not significant (p = 0.682).