Table 2. Correlations between age and BP_ND of [¹¹C]-(+)-PHNO.

	Substantia nigra	Hypothalamus	Ventral pallidum	Globus pallidus	Ventral striatum	Caudate	Putamen
Correlations between age and BPND of [11C]-(+)-PHNO
r	0.00	−0.10	0.19	−0.07	−0.23	−0.32	−0.19
P-value	0.99	0.45	0.15	0.58	0.05	0.005	0.12
Partial correlations between age and BPND of [11C]-(+)-PHNO controlling for gender
r	0.00	−0.11	0.23	−0.07	−0.23	−0.33	−0.19
P-value	0.99	0.43	0.08	0.58	0.06	0.006	0.12

BP_ND, binding potential nondisplaceable. Correlation analyses were performed to determine the association between age and BP_ND with [¹¹C]-(+)-PHNO in each region, including the substantia nigra and hypothalamus, which represent specific D₃ receptor regions, the globus pallidus and ventral pallidum, which represent preferential D₃ receptor regions, and the caudate and putamen, which represent specific D₂ receptor regions. Partial correlation analyses were performed to determine the association between age and BP_ND with [¹¹C]-(+)-PHNO in each region, controlling for gender. The numbers of subjects were 72 for the substantia nigra, globus pallidus, ventral striatum, caudate, and putamen, and 60 for the hypothalamus and ventral pallidum. Bold characters=statistically significant.