TABLE 6.
Speeded naming model interaction outputs.
| Speeded naming combined scaled score | Parameter estimate (SE) | t | p |
| Left AF FA | |||
| FA*age*group | −48.79 (16.16) | −3.019 | 0.0029**(0.0174) |
| FA*group | 229.4 (86.73) | 2.645 | 0.0088** |
| FA*age | 43.62 (11.75) | 3.714 | 0.00026*** |
| Age*group | 22.43 (7.28) | 3.08 | 0.0023** |
| Left AF MD | |||
| MD*age*group | 29.40 (13.54) | 2.172 | 0.031*(0.093) |
| MD*group | −141.75 (74.23) | −1.91 | 0.0576 |
| MD*age | −24.24 (9.74) | −2.49 | 0.0139* |
| Age*group | −23.67 (11.23) | −2.11 | 0.0362* |
| Right AF FA | |||
| FA*age*group | −10.49 (11.08) | −0.948 | 0.345 |
| FA*group | 63.82 (60.59) | 1.053 | 0.294 |
| FA*age | 15.61 (8.17) | 1.91 | 0.058 |
| Age*group | 5.12 (4.74) | 1.081 | 0.281 |
| Right AF MD | |||
| MD*age*group | 16.1 (13.38) | 1.203 | 0.231 |
| MD*group | −83.8 (73.9) | −1.133 | 0.259 |
| MD*age | −3.7 (7.93) | −0.467 | 0.641 |
| Age*group | −12.86 (11.11) | −1.158 | 0.248 |
| Laterality index FA | |||
| LI*age*group | −10.05 (9.75) | −1.031 | 0.3038 |
| LI*group | 37.17 (54.35) | 0.685 | 0.494 |
| LI*age | 3.12 (7.79) | 0.4 | 0.689 |
| Age*group | 0.77 (0.48) | 1.595 | 0.112 |
| Laterality index MD | |||
| LI*age*group | 15.03 (27.07) | 0.555 | 0.579 |
| LI*group | −65.72 (144.85) | −0.454 | 0.651 |
| LI*age | −24.61 (16.14) | −1.525 | 0.130 |
| Age*group | 0.49 (0.39) | 1.235 | 0.218 |
Results are shown for the linear mixed effects models that compared diffusion-age-group interactions in predicting SN scores. Only the interaction terms and the intercept are shown. Stars correspond to the following p-values: *(p < 0.05), **(p < 0.01), ***(p < 0.001). Significant three-way interactions that survived multiple comparison correction (q < 0.05) are bolded, with the corresponding q value in parentheses. Nominally significant three-way interactions that failed to survive multiple comparison correction are italicized, with the corresponding q value in parentheses. Significant two-way interactions and intercepts are starred, but not bolded, as these were not corrected for. AF, arcuate fasciculus; SE, standard error; FA, fractional anisotropy; MD, mean diffusivity; LI, laterality index.