Table 3.
Statistical results for the prediction of hippocampal volume.
| Model |
Fornix |
Age |
Age x Fornix |
|||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Group | IVs | DTI | DV | df | F/t | p | F/t | p | F | p |
| All | L Crus, age x L Crus | FA | L hVol | 1, 319 | 0.013 | 0.909 | 5.66 | 0.018 | 1.26 | 0.262 |
| All | R Crus, age x R Crus | FA | R hVol | 1, 319 | 0.966 | 0.326 | 9.45 | 0.002 | 3.46 | 0.064 |
| All | R Crus, age x R Crus | MD | R hVol | 1, 319 | 1.22 | 0.270 | 1.78 | 0.183 | 5.22 | 0.023 |
| All | Body, age x body | MD | hVol | 1, 319 | 0.275 | 0.601 | 1.13 | 0.289 | 5.19 | 0.023 |
| All | L Crus, age x L Crus | MD | L hVol | 1, 319 | 1.59 | 0.208 | 2.58 | 0.109 | 7.4* | 0.007 |
| Young | L Crus | MD | L hVol | 106 | −0.641 | 0.523 | −0.963 | 0.338 | - | - |
| Middle | L Crus | MD | L hVol | 107 | -1.91 | 0.059 | −1.22 | 0.226 | - | - |
| Old | L Crus | MD | L hVol | 108 | −3.87 | <.001 | −1.45 | 0.150 | - | - |
| All | Body, age x body | FA | hVol | 1, 319 | 0.56 | 0.455 | 17.8 | <.001 | 9.1* | 0.003 |
| Young | Body | FA | hVol | 106 | 1.44 | 0.152 | −0.328 | 0.744 | - | - |
| Middle | Body | FA | hVol | 107 | 2.61 | 0.011 | −1.73 | 0.087 | - | - |
| Old | Body | FA | hVol | 108 | 3.26 | 0.002 | −1.45 | 0.151 | - | - |
Note. All models included age, sex, ICV, and motion parameters as independent variables in addition to the ones listed. Models with all age groups have F statistics listed whereas models for specific age groups have t statistics listed. Bold-ed = p<.05.
*
= p<.05 corrected for multiple correction.
IVs = independent variables. FA = fractional anisotropy. MD = mean diffusivity. hVol = hippocampal volume. L = left. R = right.