Table 4.
Multivariate results of voxelwise modulated gray matter density (GMD), white matter density (WMD), and partial volume corrected cerebral blood flow (CBF-PV-Corr) comparisons between controls and fighters are shown. A family wise error rate at corrected p < 0.05 was applied and the clusters surviving the threshold for each group are tabulated. The extent of the cluster, mean ± SD for the compared group in the significant cluster and the effect sizes are tabulated. Refer Fig. 6 for the location of the clusters.
| Cluster | Mean ± standard deviation (controls) | Mean ± standard deviation (fighters) | Number of voxels in the cluster | Canonical correlation (effect size) |
|---|---|---|---|---|
| Modulated gray matter density (a.u.) | ||||
| Cluster 1 | 0.39 ± 0.06 | 0.36 ± 0.05 | ||
| Cluster 2 | 0.13 ± 0.02 | 0.12 ± 0.01 | ||
| Cluster 3 | 0.1 ± 0.01 | 0.09 ± 0.01 | ||
| Cluster 4 | 0.27 ± 0.03 | 0.26 ± 0.03 | ||
| Modulated white matter density (a.u.) | ||||
| Cluster 1 | 0.31 ± 0.05 | 0.27 ± 0.05 | 104 | 0.28 ± 0.02 |
| Cluster 2 | 0.45 ± 0.05 | 0.42 ± 0.04 | 104 | 0.29 ± 0.02 |
| Cluster 3 | 0.53 ± 0.07 | 0.51 ± 0.05 | 80 | 0.28 ± 0.01 |
| Cluster 4 | 0.22 ± 0.03 | 0.2 ± 0.03 | 387 | 0.29 ± 0.03 |
| CBF-PV-Corr (ml/100 g/min) | ||||
| Cluster 1 | 67.21 ± 21.55 | 61.07 ± 19.14 | ||
| Cluster 2 | 47.44 ± 18.79 | 50.89 ± 24.59 | ||
| Cluster 3 | 60.88 ± 26.42 | 58.18 ± 22.65 | ||
| Cluster 4 | 37.09 ± 14.83 | 33.2 ± 15.35 |