Table 2.

summary of measurements obtained in each group (mean ± SD)

		HY	HO
MRS measurement	GABA+	1.05 ± 0.17	0.94 ± 0.17
		N = 38	N = 105
	GABA+/ tCr	0.15 ± 0.025	0.12 ± 0.025
		N = 38	N = 105
	tCr	7.25 ± 0.50	7.73 ± 0.79
		N = 38	N = 105
	mI	6.38 ± 0.65	7.60 ± 1.15
		N = 38	N = 105
	mI/tCr	0.89 ± 0.08	0.98 ± 0.11
		N = 38	N = 105
	tCho	1.80 ± 0.17	2.10 ± 0.35
		N = 38	N = 105
	tCho/tCr	0.248 ± 0.022	0.268 ± 0.035
		N = 38	N = 105
	tNAA	9.66 ± 0.83	9.75 ± 1.24
		N = 38	N = 105
	tNAA/tCr	1.34 ± 0.11	1.30 ± 0.15
		N = 38	N = 105
	Glu+Gln (Glx)	9.33 ± 1.30	8.74 ± 1.04
		N = 40	N = 105
	Glx/tCr	1.28 ± 0.36	1.18 ± 0.43
		N = 40	N = 105
MRS voxel tissue fraction	GM	0.51 ± 0.03	0.44 ± 0.04
		N = 40	N = 105
	WM	0.36 ± 0.04	0.36 ± 0.06
		N = 40	N = 105
	CSF	0.14 ± 0.03	0.19 ± 0.05
		N = 40	N = 105