Table 2. The Salivary Gland Uptake (SUVR) According to the Pattern Based on PET Images.

Parameter	Salivary Glands	Pattern Based on PET Images				P
		Non-DD (n = 110)	IPD (n = 86)	Aty-P (n = 7)	VP (n = 16)	Non-DD vs. IPD	Non-DD vs. Aty-P	Non-DD vs. IPD + Aty-P	Non-DD vs. VP
Early phase	Right parotid	0.49 ± 0.20	0.60 ± 0.21	0.59 ± 1.50	0.52 ± 0.18	< 0.001	0.099	< 0.001	0.484
	Left parotid	0.50 ± 0.20	0.61 ± 0.22	0.63 ± 0.13	0.56 ± 0.27	0.001	0.069	< 0.001	0.621
	Average	0.50 ± 0.19	0.60 ± 0.21	0.61 ± 1.34	0.54 ± 0.22	< 0.001	0.046	< 0.001	0.484
Delayed phase	Right parotid	2.21 ± 0.46	2.21 ± 0.58	2.14 ± 0.52	2.31 ± 0.95	0.995	0.642	0.820	0.717
	Left parotid	2.24 ± 0.47	2.27 ± 0.85	2.28 ± 0.39	2.38 ± 1.00	0.826	0.814	0.995	0.604
	Average	2.23 ± 0.44	2.24 ± 0.59	2.21 ± 0.44	2.34 ± 0.97	0.911	0.868	0.961	0.818
Delayed-to-early ratio	Right parotid	5.11 ± 1.74	4.02 ± 1.38	3.79 ± 1.04	4.66 ± 1.40	< 0.001	0.046	< 0.001	0.324
	Left parotid	4.99 ± 1.74	3.99 ± 1.43	3.73 ± 0.90	4.60 ± 1.38	< 0.001	0.045	< 0.001	0.422
	Average	5.05 ± 1.70	4.01 ± 1.31	3.76 ± 0.96	4.63 ± 1.36	< 0.001	0.045	< 0.001	0.354

The values are expressed as mean ± standard deviation or number unless otherwise indicated. All P-values are calculated against “non-DD” group. SUVR = standardized uptake value ratio, PET = positron emission tomography, Non-DD = non-dopaminergic degradation, IPD = idiopathic parkinson’s disease, Aty-P = atypical parkinsonism, VP = vascular parkinsonism