Table 2.
Technical details and main findings of the eight studies included in this meta-analysis.
| References | Field | Acquisition voxel (mm3) | No. of directions | Coordinate system | No. of coordinates | Type of analysis | Main findings of FA |
|---|---|---|---|---|---|---|---|
| Sigurdsson et al. (27) | 3 T | 1 × 1 × 2 | 32 | MNI | 0 | TBSS | Negative |
| Wen et al. (11) | 3 T | 1 × 1 × 1 | 30 | MNI | 12 | TBSS | Decreased FA in the body of corpus callosum, forceps major, right inferior longitudinal fasciculus, right inferior fronto-occipital fasciculus, right corticospinal tract, left frontal lobe subgyral, left anterior thalamic radiations, and bilateral superior longitudinal fasciculus |
| Müller-Vahl et al. (25) | 1.5 T | NA | 12 | MNI | 11 | VBA | Decreased FA in the bilaterally in the medial frontal gyrus, the pars opercularis of the left inferior frontal gyrus, the middle occipital gyrus, the right cingulate gyrus, and the medial premotor cortex |
| Jeppesen et al. (28) | 3 T | 1 × 1 × 1 | 15 | MNI | 0 | TBSS | Negative |
| Liu et al. (29) | 1.5 T | NA | 15 | MNI | 0 | TBSS | Negative |
| Govindan et al. (17) | 3.0 T | 3 × 3 × 3 | 6 | MNI | 0 | TBSS | Negative |
| Neuner et al. (24) | 1.5 T | 2 × 2 × 2 | 30 | MNI | 9 | TBSS | Decreased FA in the corticospinal tract, the corpus callosum and long association fiber pathways such as the inferior fronto-occipital fascicle and the superior longitudinal fascicle as well as in the uncinate fascicle |
| Thomalla et al. (26) | 3 T | 2 × 2 × 2 | 24 | MNI | 1 | VBA | Increased FA in the mesial part of the left central and postcentral gyrus |
No., number; FA, fractional anisotropy; MNI, Montreal Neurological Institute; TBSS, tract-based spatial statistics; VBA, voxel-based analysis.