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Sample distribution of the pediatric cohort, voxel tissue composition, and metabolite concentrations^{^a}
Parameters 
No. 23
Sex (male/female) 12/11
Age (yr) 5.6–13.9; 10.2 ± 2.5
 Male 5.6–13.9; 9.81 ± 3.01
 Female 8.1–13.1; 10.61 ± 1.76
Race (No.) 
 Black/African-American 4
 White 16
 >1 race 3
Voxel tissue composition 
 Gray matter (%) 51.7 ± 4.8
 White matter (%) 31.0 ± 3.5
 GM_ratio (%) 62.5 ± 3.8
Metabolite levels 
 GABA+_H2O (i.u.) 2.70–4.37; 3.35 ± 0.48
 GABA+/Cr 0.073–0.120; 0.102 ± 0.011
 GSH_H2O (i.u.) 1.07–1.92; 1.50 ± 0.24
 GSH/Cr 0.036–0.058; 0.05 ± 0.006
↵a Data are minimum–maximum; mean ± SD.

Parameters
No.	23
Sex (male/female)	12/11
Age (yr)	5.6–13.9; 10.2 ± 2.5
Male	5.6–13.9; 9.81 ± 3.01
Female	8.1–13.1; 10.61 ± 1.76
Race (No.)
Black/African-American	4
White	16
>1 race	3
Voxel tissue composition
Gray matter (%)	51.7 ± 4.8
White matter (%)	31.0 ± 3.5
GM_ratio (%)	62.5 ± 3.8
Metabolite levels
GABA+_H2O (i.u.)	2.70–4.37; 3.35 ± 0.48
GABA+/Cr	0.073–0.120; 0.102 ± 0.011
GSH_H2O (i.u.)	1.07–1.92; 1.50 ± 0.24
GSH/Cr	0.036–0.058; 0.05 ± 0.006