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Receiver-operating characteristic curve of pressure recovery time as a predictor of multiple system atrophy-Parkinson type in patients with autonomic dysfunction and parkinsonism. Cut-off value is 5.5 s (sensitivity, 71.4%; specificity, 72.7%). Area under the ROC curve is 0.713 (95% CI, 0.615–0.910). ROC: Receiver-operating characteristic; CI: Confidence interval.
