Table 3.
Means and Standard Deviations of Dependent Variables
| |
SBM |
|
|
|||
|---|---|---|---|---|---|---|
| |
Tectal beaking (n=51) |
Normal tectum (n=29) |
TD (n=26) |
|||
| M | SD | M | SD | M | SD | |
| Fractional anisotropy (×10−6 mm2/sec) | ||||||
| Frontal | 0.4416a | 0.0349 | 0.4365a | 0.0429 | 0.4431a | 0.0178 |
| Parietal | 0.4310a | 0.0295 | 0.4326a | 0.0365 | 0.4543b | 0.0168 |
| Radial diffusivity (×10−3 mm2/sec)+ | ||||||
| Frontal | 598.3a | 43.6 | 584.8a | 48.7 | 562.2b | 21.7 |
| Parietal | 641.3a | 57.6 | 614.8a | 49.5 | 571.5b | 21.6 |
| Axial diffusivity (×10−3 mm2/sec)+ | ||||||
| Frontal | 1227.7a | 57.4 | 1189.1b | 30.1 | 1165.2b | 20.8 |
| Parietal | 1284.0a | 75.4 | 1238.7b | 34.6 | 1212.6b | 22.3 |
| Tectal volume (mm3) | ||||||
| Right tectal volume | 773.8a | 204.7 | 781.7a | 199.9 | 993.8b | 286.2 |
| Left tectal volume | 793.4a | 202.4 | 790.4a | 213.1 | 1022.0b | 316.8 |
| Total tectal volume | 1567.3a | 394.7 | 1572.0a | 398.7 | 2015.9b | 587.7 |
| Pathway volume (mm3) | ||||||
| Frontal pathway | 12297a | 2772 | 12513a | 2327 | 12921a | 1131 |
| Parietal pathway | 10624a | 2241 | 10941a | 2307 | 11176a | 1135 |
+
Value multiplied by factor of 1000; differences in alphabetic superscript for means denotes significant analysis of covariance between groups at p<0.01, means with the same superscript do not significantly differ; diffusion tensor imaging metrics include age as covariate, volumetric measurements include brain volume excluding CSF as covariate.
CSF, cerebrospinal fluid.