Figure 1: Graphic representation of the diagnostic performance of SUDOSCAN risk score, by Receiver Operating Curve (ROC) analysis when choosing LF power component value during moderate activity < 90 ms2 (1st quartile) as reference value. With a risk score cut-off point of < 40% (optimal Youden index), sensitivity was 83%, specificity was 63% and the Youden index was 0.46