Table 2.

Summary of the average strain threshold (ε_thresh; from 100 random trials) and standard deviation for each injury susceptibility index.

Susceptibility index variable	${\phi }_{\mathit{\text{ROI}}}^{{\epsilon }_p}$	${\phi }_{\mathit{\text{ROI}}}^{{\epsilon }_n}$	φtract	${\phi }_{\mathit{\text{tract}}}^{\mathit{\text{enhanced}}}$	${\phi }_{\mathit{\text{tract}}}^{\mathit{\text{point}}}$
Optimal εthresh	0.20±0.01	0.09±0.01	0.21±0.01	0.10±0.01	0.10±0.01