Table 5.
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. 7 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 | 0.41 ± 0.06 | 0.37 ± 0.06 | ||
| Cluster 2 | 0.42 ± 0.04 | 0.41 ± 0.03 | ||
| Cluster 3 | 0.13 ± 0.01 | 0.12 ± 0.01 | ||
| Cluster 4 | 0.11 ± 0.01 | 0.1 ± 0.01 | ||
| Cluster 5 | 0.27 ± 0.03 | 0.26 ± 0.03 | ||
| Modulated white matter density (a.u.) | ||||
| Cluster 1 | 0.3 ± 0.05 | 0.26 ± 0.05 | 69 | 0.3 ± 0.02 |
| Cluster 2 | 0.24 ± 0.03 | 0.24 ± 0.02 | 134 | 0.3 ± 0.02 |
| Cluster 3 | 0.46 ± 0.05 | 0.43 ± 0.05 | 147 | 0.28 ± 0.02 |
| Cluster 4 | 0.48 ± 0.06 | 0.46 ± 0.05 | 183 | 0.27 ± 0.01 |
| Cluster 5 | 0.22 ± 0.03 | 0.21 ± 0.03 | 365 | 0.3 ± 0.03 |
| CBF-NonPV-Corr (ml/100 g/min) | ||||
| Cluster 1 | 42.99 ± 12.43 | 38.46 ± 11.74 | ||
| Cluster 2 | 52.81 ± 14.08 | 42.05 ± 12.59 | ||
| Cluster 3 | 30.15 ± 11.94 | 32.05 ± 13.74 | ||
| Cluster 4 | 33.42 ± 11.63 | 31.27 ± 11.47 | ||
| Cluster 5 | 23.66 ± 7.92 | 22.46 ± 9.43 |