80 Chapter 5 Figure 2. Scatterplots of FA (scalar value ranging between 0 and 1) and MD (mm2/sec). FA, fractional anisotropy; MD, mean diffusivity. Mean diffusivity The results of the linear regression on values of MD of the analyzed white matter tracts are shown in Table 2, showing the effect of trigonocephaly, age, and gender on the MD values. No significant difference in the MD values was found in the frontal lobe tracts comparing patients to controls. The effect of gender was not significant on the MD values in the different tracts. The effect of age was significant for the left ATR, left and right CGC, FMI, left and right IFO, and the left UNC (P < 0.0025). The effect of
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