Table 2.

Percentage decrease of the binding potential (BP) of the DAT in striatum region in healthy individuals, divided by age group.

Age group	Regions	DAT-BP∗	Decrease in relation to 18–30 yrs age group
18–30 yrs	Total striatum	4.05 ± 0.46
	Right striatum	1.54 ± 0.24
	Left striatum	1.77 ± 0.33
31–40 yrs	Total striatum	3.54 ± 0.58	13%
	Right striatum	1.27 ± 0.30	18%
	Left striatum	1.42 ± 0.37	20%
41–50 yrs	Total striatum	3.29 ± 0.55	19%
	Right striatum	1.15 ± 0.30	25%
	Left striatum	1.23 ± 0.37	31%
51–60 yrs	Total striatum	2.90 ± 0.66	28%
	Right striatum	0.95 ± 0.34	38%
	Left striatum	0.99 ± 0.35	44%
61–70 yrs	Total striatum	2.61 ± 0.63	36%
	Right striatum	0.80 ± 0.31	48%
	Left striatum	0.81 ± 0.33	54%
71–80 yrs	Total striatum	2.36 ± 0.13	42%
	Right striatum	0.68 ± 0.06	56%
	Left striatum	0.71 ± 0.15	60%

DAT-BP = dopamine transporter binding potential.

^∗Mean ± std. deviation.