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. Author manuscript; available in PMC: 2019 Sep 30.
Published in final edited form as: Psychiatry Res Neuroimaging. 2018 Jul 29;279:22–30. doi: 10.1016/j.pscychresns.2018.07.003

Table 1.

Correlations between PRESS and two MEGA-PRESS measures of glutamate

Controls (n=25) Patients (n=17) All (n=42)
r (r2) with
PRESS		 CoV
(%)		 r (r2) with
PRESS		 CoV
(%)		 r (r2) with
PRESS		 CoV
(%)
PRESS --- 9.2 --- 8.2 --- 8.7
MP-Off 0.89 (0.79) 8.2 0.83 (0.69) 6.1 0.87 (0.75) 7.3
MP-Diff 0.11 (0.01)** 11.5 0.42 (0.18)* 9.7 0.22 (0.05)** 11.0

CoV = coefficient of variation; PRESS = PRESS with 80 ms TE; MP-Off = MEGA-PRESS off resonance spectra; MP-Diff = MEGA-PRESS difference spectra; all correlations shown are between glutamate/creatine ratios from LCModel fits.

**

lower than PRESS vs MP-Off correlation, p < .0001

*

lower than PRESS vs MP-Off correlation, p < .05