Table 5.

Age-group difference in GABA

Model	B	β	SE	t	p
Model 1: age group
Age group	−0.245	−0.255	0.122	−2.011	0.049*
Model 2: age group and GM
Age group	0.053	0.055	0.127	0.416	0.679
Fraction GM	5.145	0.569	1.201	4.28	0.000***

*p < 0.05,

**p < 0.01,

***p < 0.001.