Table 3.1.

Pearson correlations between GABA levels, exposure levels, brain R1 values and age, listed as correlation coefficients ( r ) and p values (p)

		GABA (Str)	Exp (P3M)	Exp (P12M)	Exp (CUM)	R1 (GP)	R1 (CN)	R1 (FT)	R1 (SN)	Age
GABA (Thal)	r	0.24	0.37	0.47	0.25	−0.03	0.05	0.34	0.51	0.21
	p	0.15	0.02	0.002	0.12	0.84	0.76	0.04	0.001	0.19
GABA (Str)	r		−0.003	0.14	0.09	0.13	0.11	0.56	0.341	0.16
	p		0.98	0.40	0.60	0.44	0.51	0.0003	0.04	0.34
Exp (P3M)	r			0.77	0.27	0.11	−0.03	−0.02	0.22	−0.05
	p			<0.0001	0.10	0.50	0.88	0.90	0.17	0.75
Exp (P12M)	r				0.29	0.04	−0.05	−0.05	0.25	0.02
	p				0.07	0.80	0.78	0.78	0.12	0.91
Exp (CUM)	r					0.07	−0.06	−0.01	0.12	0.43
	p					0.65	0.71	0.95	0.47	0.006
R1 (GP)	r						0.80	0.40	0.63	0.26
	p						<0.0001	0.01	<0.0001	0.11
R1 (CN)	r							0.54	0.66	−0.01
	p							0.0003	<0.0001	0.94
R1 (FT)	r								0.75	−0.12
	p								<0.0001	0.45
R1 (SN)	r									0.13
	p									0.42

GABA (Thal): thalamic GABA levels; GABA (Str): striatal GABA levels; Exp (P3M): past-3-month exposure levels; Exp (P12M): past-12-months exposure levels; Exp (CUM): cumulative exposure levels; R1 (GP): R1 values from the globus pallidus; R1(CN): R1 values from the caudate nucleus; R1 (FT): R1 values from the frontal cortex; R1 (SN): R1 values from the substantia nigra