Table 2. Internal validity (rho coefficients) and precision (SEM) of the Scales for Outcomes in Parkinson’s Disease-Autonomic questionnaire (SCOPA-AUT) domains for the 150 patients with Parkinson’s disease and the forty matched controls who were enrolled in the current study.

Gastr.: Gastrointestinal, Urin.: Urinary, Cardio: Cardiovascular, Ther.: Thermoregulatory, Pup.: Pupillomotor, SEM: standard error of measurement, *: p =0.000, **: p =0.003, ^: p =0.017, #: SEM =lower than ½ standard deviation, unmarked coefficients are not significant