Table 3. Multivariate analysis—Age effects on binding among TBI subjects.

Variable	Caudate—CFT: R2=0.588		Putamen—CFT: R2=0.673		Striatum—CFT: R2=0.285
	Estimate	P-value	Estimate	P-value	Estimate	P-value
Intercept	3.347	0.052	2.667	0.003	2.228	0.070
Age	0.016	0.338	0.043	0.127	0.052	0.264
DAT	−2.838	0.032	−1.575	0.009	−1.366	0.123

	Caudate—RAC: R2=0.143		Putamen—RAC: R2=0.146		Striatum—RAC: R2=0.370
	Estimate	P-value	Estimate	P-value	Estimate	P-value
Intercept	2.856	<0.001	3.233	<0.001	3.157	<0.001
Age	0.002	0.906	−0.013	0.413	−0.009	0.483
DRD2	−0.326	0.373	−0.003	0.992	−0.216	0.346

DAT, dopamine transporter; DRD2, D2 receptor gene; TBI, traumatic brain injury.

Bold entries are made for P-values representing comparisons that are statistically significant.