Fig. 3
NAA concentrations in the a GM and b WM regions of male and female subjects. Concentrations are given in millimoles per tissue water volume. Female subjects show a significantly higher concentration. Data represent means ± SEM; n = 24; unpaired t test with Welch’s correction; a η2 = 0.35; p = 0.009; b η2 = 0.25; p = 0.01 (*p < 0.05; **p < 0.01); GM = gray matter, WM = white matter