Table 2.

Factional anisotropy in smokers and nonsmokers.

ROI
Region of Interest	Fractional Anisotropy (dimensionless)
	Smokers	Non-Smokers
Genu corpus callosum	0.88 ± 0.04*	0.84 ± 0.05
Splenium corpus callosum	0.90 ± 0.05	0.89 ± 0.04
anterior corona radiata:
left	0.60 ± 0.07	0.56 ± 0.07
right	0.58 ± 0.08	0.58 ± 0.08
midcaudal superior corona radiata:
left	0.44 ± 0.08	0.41 ± 0.07
right	0.43 ± 0.06	0.43 ± 0.07
caudal superior corona radiata:
left	0.51 ± 0.08	0.47 ± 0.07
right	0.48 ± 0.07	0.48 ± 0.08
internal capsule anterior limb		0
left	0.54 ± 0.07	00.51 ± 0.09
right	0.53 ± 0.08	0.50 ± 0.08
Genu internal capsule
Left	0.63 ± 0.06	0.62 ± 0.07
right	0.63 ± 0.06	0.60 ± 0.06
internal capsule posterior limb
left	0.70 ± 0.06	0.70 ± 0.06
right	0.75 ± 0.04	0.74 ± 0.04
perforant path
left	0.54 ± 0.07	0.54 ± 0.09
right	0.54 ± 0.07	0.52 ± 0.08
anterior cingulum
left	0.49 ± 0.09	0.45 ± 0.11
right	0.42 ± 0.09	0.37 ± 0.11
middle cingulum
left	0.72 ± 0.06*	0.66 ± 0.08
right	0.66 ± 0.08*	0.61 ± 0.08
posterior cingulum
left	0.51 ± 0.09	0.54 ± 0.08
right	0.52 ± 0.10	0.49 ± 0.10

Values tabulated are group means ± SD.

Significant difference from nonsmoker group, p<*0.05, **0.01 protected post-hoc T-Test (rank-transformed, therefore nonparametric) following omnibus repeated-measures MANCOVA covarying age and years-of-education.