Table 4. Summary of Significant Diffusion Metrics Regions-of-Interest (ROIs) Associated With Neuropsychiatric Symptoms (Traumatic Brain Injury Only).

Model	β (SE)	t value	P value	LRT	VIF	R2 a
Fractional anisotropy of left UNC =  NSI cognitive + age + mean displacement
NSI cognitive	5.4 × 10−3 (1.9 × 10−3)	2.77	.003	57.9	1.06	0.195
Age	9.2 × 10−4 (1.1 × 10−3)	0.79	.21	36.9	1.08
Mean displacement	−0.130 (0.046)	−2.82	.003	103.5	1.10
ISOVF of genu CC = PCLC total + age + mean displacement
PCLC total	4.3 × 10−4 (1.9 × 10−4)	2.15	.01	48.3	1.01	0.079
Age	1.8 × 10−4 (4.6 × 10−4)	−0.40	.35	11.4	1.06
Mean displacement	−0.014 (0.018)	−0.776	.21	17.4	1.07
ODI of left fornix/ST = PCLC-C + age + mean displacement
PCLC-C	1.2 × 10−3 (5.5 × 10−4)	2.09	.02	33.6	1.02	0.289
Age	1.9 × 10−3 (6.2 × 10−4)	3.06	.001	162.2	1.06
Mean displacement	0.55 (0.024)	2.26	.01	83.9	1.07

Abbreviations: CC, corpus callosum; ISOVF, isotropic volume fraction; LRT, likelihood ratio test; NSI, Neurobehavioral Symptom Inventory; PCLC, Posttraumatic Stress Disorder Checklist–Civilian version; ST, stria terminalis; UNC, uncinate fasciculus; VIF, variance inflation factor.

^a R² calculated by 1 – (SS residual / SS total), where SS is the sum of the square.