Table 3. Summary of hierarchical regression results: variables predicting GABA/W.

Variables	B	B-SE	Beta	t	P-value	R	R2	ΔR2	Sig. ΔF
Model 1						0.14	0.02	0.02	0.38
Anxiety	−3.13 × 10−6	<0.0005	−0.14	−0.88	0.38
Model 2						0.16	0.02	0.004	0.70
Suicidality	−4.52 × 10−6	<0.0005	−0.06	−0.39	0.70
Model 3						0.40	0.16	0.14	0.02*
Anhedonia	−6.87 × 10−5	<0.0005	−0.43	−2.40	0.02*
Model 4						0.40	0.16	<0.0005	0.96
Depression	−4.87 × 10−7	<0.0005	−0.01	−0.05	0.96

Abbreviations: GABA, γ-aminobutyric acid; W, unsuppressed voxel tissue water signal.

*Significant (P<0.05).