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The values of NAA, Lip2, (Lac + Lip1 + Lip2)/Cr1 ratio, and Cho/NAA ratio within the tumor regions in the training (A-D) and validation sets (E-H). The Student's t-test was used to obtain the statistical difference between the high- (red) and low-grade gliomas (green). The data are presented as means ± standard deviation of the parameters, NAA (A and E), Lip2 (B and F), (Lac + Lip1 + Lip2)/Cr1 ratio (C and G), and Cho/NAA ratio (D and H).
* indicates P < 0.05; ** indicates P < 0.01.
