FIGURE 3.

Estimated marginal means (x‐axis) for each metric in cervical vertebral levels (y‐axis) for healthy volunteers data. The blue bars are confidence intervals for the estimated marginal means, and the red arrows are for the comparisons among them. If an arrow from one level overlaps an arrow from another level, the difference is not significant (p‐value >.05). Else, the difference is significant (p‐value <.05). The unit of free water weight (FWW), stick axial diffusivity (Stick‐AD), axial diffusivity (AD), mean diffusivity (MD), and radial diffusivity (RD) is mm²/s. FA, fractional anisotropy.