Table 4.

Initial specific to non-specific binding ratios (SNBRs), absolute annual reduction (AAR), and relative annual reduction (RAR) of the striatal subregions in the Parkinson’s disease (PD) and non-PD groups

		Initial SNBR		AAR (/year)		RAR (%/year)
Region	Side	PD	Non-PD	PD	Non-PD	PD	Non-PD
Total striatum	Contralateral	3.8 ± 1.2**	6.3 ± 0.8	0.25 ± 0.14*	0.10 ± 0.17	7.1 ± 3.6**	1.3 ± 2.4
	Ipsilateral	4.2 ± 1.2**	6.4 ± 0.8	0.27 ± 0.14*	0.08 ± 0.22	6.7 ± 3.5**	1.0 ± 3.2
	Mean	4.0 ± 1.2**	6.4 ± 0.8	0.26 ± 0.14*	0.09 ± 0.19	6.9 ± 3.5**	1.2 ± 2.7
Subregion
CA	Contralateral	4.8 ± 1.6	5.6 ± 0.8	0.29 ± 0.20*	0.12 ± 0.16	6.6 ± 4.4*	2.0 ± 2.6
	Ipsilateral	5.1 ± 1.5	5.7 ± 0.9	0.26 ± 0.21	0.09 ± 0.22	5.4 ± 4.3*	1.4 ± 3.9
	Mean	5.0 ± 1.5	5.6 ± 0.8	0.28 ± 0.20*	0.11 ± 0.18	6.0 ± 4.2*	1.7 ± 3.0
VS	Contralateral	4.8 ± 1.2*	6.1 ± 0.9	0.22 ± 0.19	0.10 ± 0.16	4.9 ± 3.9*	1.5 ± 2.4
	Ipsilateral	5.0 ± 1.1*	6.2 ± 0.9	0.21 ± 0.21*	−0.01 ± 0.20	4.4 ± 4.2*	−0.2 ± 3.0
	Mean	4.9 ± 1.1*	6.2 ± 0.9	0.22 ± 0.19*	0.04 ± 0.16	4.6 ± 3.9*	0.7 ± 2.5
AP	Contralateral	3.7 ± 1.3**	7.2 ± 1.1	0.28 ± 0.14*	0.07 ± 0.24	8.4 ± 4.3**	0.8 ± 3.1
	Ipsilateral	4.3 ± 1.5**	7.2 ± 1.1	0.33 ± 0.20*	0.10 ± 0.27	8.2 ± 4.8**	1.2 ± 3.5
	Mean	4.0 ± 1.4**	7.2 ± 1.1	0.31 ± 0.16*	0.09 ± 0.24	8.3 ± 4.3**	1.0 ± 3.0
PP	Contralateral	2.3 ± 1.0**	6.7 ± 0.9	0.21 ± 0.13*	0.09 ± 0.18	9.4 ± 4.2**	1.1 ± 2.3
	Ipsilateral	2.9 ± 1.2**	6.8 ± 0.9	0.27 ± 0.12*	0.09 ± 0.23	9.7 ± 3.6**	1.2 ± 3.1
	Mean	2.6 ± 1.1**	6.7 ± 0.9	0.24 ± 0.11*	0.09 ± 0.20	9.6 ± 3.6**	1.2 ± 2.7

*< 0.05, **< 0.001; CA caudate nucleus; VS ventral striatum; AP anterior putamen; PP posterior putamen