CBS and Parkinson disease: The correlation was significant in patients with PD (r = 0.34, p = 0.004) and PSP (r = 0.77, p = 0.004) but not in those with MSA (r = 0.24, p = 0.45), CBS (r = 0.15, p = 0.78), or AD (r = 0.33, p = 0.40).