Table 1.
Standardized beta and statistical significances obtained with a GLM model between the mean fractional anisotropy (FA) and axial diffusivity (AD) of the WM fiber-bundles (forceps major (Fmajor), forceps minor (Fminor), cortico-spinal tract (CST), superior and inferior longitudinal fascicle (SLF and ILF respectively), uncinate fascicle (Unc), and inferior fronto-occipital fascicle (IFOF)) and the IQ scores (full scale intelligence quotient (FSIQ), verbal comprehension index (VCI), perceptual reasoning index (PRI), working memory index (WMI), and processing speed index (PSI)).
| FSIQ | VCI | PRI | WMI | PSI | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| FA | AD | FA | AD | FA | AD | FA | AD | FA | AD | |
| Fmajor | 0.333* | 0.519*** | – | 0.446*** | – | 0.337* | – | 0.436** | – | – |
| Fminor | 0.337* | 0.566*** | 0.379* | 0.526*** | – | 0.404* | – | 0.389* | – | – |
| CST | ||||||||||
| L | – | – | – | 0.378* | – | – | – | – | – | – |
| R | – | 0.339* | – | 0.334* | – | – | – | – | – | – |
| SLF | ||||||||||
| L | 0.372* | – | – | – | – | – | – | – | – | – |
| R | – | 0.483*** | – | 0.423** | – | 0.332* | – | 0.485** | – | – |
| ILF | ||||||||||
| L | 0.440* | – | – | 0.344* | – | – | – | – | 0.414* | – |
| R | – | 0.460*** | – | – | – | 0.372* | – | 0.428** | – | – |
| Unc | ||||||||||
| L | 0.417* | 0.401** | – | 0.411** | 0.437* | 0.370* | – | – | – | – |
| R | 0.355* | 0.625*** | – | 0.521*** | 0.359* | 0.517*** | – | 0.509** | – | – |
| IFOF | ||||||||||
| L | 0.507** | 0.355* | 0.526** | 0.469** | 0.373* | – | – | – | – | – |
| R | 0.354* | 0.497*** | 0.382* | 0.430** | – | 0.393* | – | 0.417** | – | – |
Values in bold represent correlations with a significant effect for gender.
*p < 0.05; **p < 0.01; ***p < 0.001.