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. Author manuscript; available in PMC: 2012 Mar 31.
Published in final edited form as: Psychiatry Res. 2011 Mar 31;191(3):201–211. doi: 10.1016/j.pscychresns.2010.10.005

Table 3.

Slopes and y-intercepts: Linear regression of metabolites vs. percent GM

MRJ (n=13) NU (n=10) F1,23 P
Slope Cho/Cr −.017±.015** −.030±.023** 2.82 .11
mI/Cr −.002±.010 −.006±.008** 4.76 .04*
NAA/Cr .002±.017 .003±.013 0.01 ns
NAA + NAAG/Cr −.002±.021 −.004±.016 0.09 ns
Glu/Cr −.001±.013 −.003±.009 .01 ns
Gln/Cr −.002±.017 .003±.006 1.97 .18
y-intercept Cho/Cr WM 0.39±0.09 0.46±0.10 2.43 .14
Cho/Cr GM 0.23±0.08 0.17±0.13 2.66 .12
mI/Cr WM 1.08±0.44 1.39±0.37 10.36 .005*
mI/Cr GM 0.88±0.61 0.81±0.48 1.61 ns

Data represent group averages (± SD) of the slope of the linear regression of metabolites normalized to Cr and %GM, and estimated y-intercept values for metabolite ratios at 0% GM (WM) and at 100% GM.

*

Indicates statistically significant group difference and

**

indicates slope significantly different from zero, P < .05. Abbreviations: Cho, Choline; mI, myo-Inositol; NAA, N-acetyl-aspartate; NAA + NAAG, N-acetyl-aspartate + N-acetyl-aspartyl-glutamate; Glu, glutamate; Gln, glutamine; WM, white matter; GM, grey matter