TABLE 2.

Multiple linear regression results to model cerebral blood flow (CBF) with gamma-aminobutyric acid (GABA), glutamate-glutamine complex (Glx), and GABA-by-Glx cross term for all, younger, and older participants.

		Whole model		Individual parameter
		F	p	parameter	β	t	p
All	CBF	6.47	0.004*	GABA	0.18	0.03	0.97
				Glx	2.99	3.46	0.003*
				GABA⋅Glx	1.82	1.55	0.14
Younger	CBF	2.39	0.17	GABA	14.61	1.59	0.16
				Glx	0.13	0.06	0.96
				GABA⋅Glx	0.19	0.04	0.97
Older	CBF	1.70	0.24	GABA	−11.67	−1.33	0.22
				Glx	2.98	2.14	0.06
				GABA⋅Glx	0.22	0.09	0.93

β denotes the model coefficient, and F, t, and p denote standard statistical parameters for F-statistics, t-statistics and alpha threshold, respectively.

*Significant at p ≤ 0.05. Bolded text is to indicate significant or trending results.