Table 3.

Genetic Impact on Neuroimaging Variables

Left Hemisphere					Right Hemisphere
Metric	TT vs MM	t	p	Effect size	TT vs MM	t	p	Effect size
SLF N = 38 a
FA	−2.198	−2.344	0.025*	−0.606	−1.999	−1.943	0.061	−0.507
MD	−0.003	−1.754	0.089	−0.460	−0.004	−1.601	0.119	−0.421
Length	−3.741	−2.039	0.049*	−0.531	−3.685	−1.879	0.069	−0.491
ILF N = 38 a
FA	−1.353	−1.251	0.220	−0.331	−0.477	−0.411	−0.684	−0.110
MD	−0.004	−1.525	0.137	−0.402	−0.002	−0.742	0.464	−0.198
Length	−2.902	−1.408	0.169	−0.372	−1.581	−0.706	0.485	−0.188
Cingulum CG N = 37 b
FA	−4.875	−2.657	0.012*	−0.708	0.133	0.102	0.919	0.028
MD	−0.008	−2.649	0.013*	−0.706	0.001	0.334	0.741	0.093
Length	−8.408	−2.704	0.011*	−0.720	0.828	0.345	0.732	0.096
IFOF N= 37 b
FA	−4.378	−1.750	0.090	−0.459	−4.088	−1.726	0.094	−0.453
MD	−0.008	−1.516	0.139	−0.399	−0.009	−1.743	0.091	−0.457
Length	−7.385	−1.560	0.129	−0.411	−8.197	−1.774	0.085	−0.465
CST N = 37 b
FA	−2.349	−1.012	0.319	−0.280	−2.143	−0.894	0.377	−0.248
MD	−0.003	−0.602	0.551	−0.167	0.002	−0.400	0.692	−0.111
Length	−2.400	−0.590	0.560	−0.164	−2.548	−0.581	0.566	−0.161
ATR N = 37 b
FA	−2.168	−1.339	0.190	−0.368	−0.856	−0.535	0.596	−0.149
MD	−0.005	−1.572	0.126	−0.430	0.001	0.344	0.733	0.096
Length	−4.160	−1.305	0.202	−0.359	−0.106	−0.032	0.975	−0.009

^*Statistically Significant p< .05,

^aMM n = 22, TT n = 16,

^bMM n = 22, TT n = 15