Table 3.
Knot positions of segmented linear regression and standard deviations (SDs) for fractional anisotropy (FA), mean diffusivity (MD), axial diffusivity (AD), and radial diffusivity (RD) in all investigated tract systems.
| FA | MD | AD | RD | |||||
|---|---|---|---|---|---|---|---|---|
| xknot/y | SD of xknot/y | xknot/y | SD of xknot/y | xknot/y | SD of xknot/y | xknot/y | SD of xknot/y | |
| CST | 61.2 | 8.4 | 51.6 | 8.9 | 53.8 | 9.4 | 51.2 | 9.8 |
| Fronto-occipital tract | 36.6 | 8.3 | 58.3 | 9.5 | 58.3 | 9.0 | 68.0 | 10.0 |
| Fasciculus uncinatus | 60.6 | 9.3 | 50.9 | 8.7 | 51.0 | 9.1 | 50.7 | 8.9 |
| Optic radiation | – | – | 51.0 | 8.8 | 52.8 | 8.6 | 50.8 | 8.6 |
| SLF | 61.7 | 8.5 | 51.0 | 9.2 | 51.2 | 9.0 | 50.7 | 7.9 |
| ILF | 36.7 | 8.8 | 50.7 | 8.2 | 51.0 | 8.8 | 48.1 | 8.4 |
| Cingulum | 53.7 | 8.8 | 58.2 | 9.9 | 68.0 | 10.9 | 57.7 | 9.7 |
| SCP | – | – | 55.0 | 9.0 | 50.7 | 9.0 | – | – |
| MCP | 47.1 | 9.4 | 43.8 | 9.0 | 44.4 | 8.1 | 43.6 | 9.2 |
| Corticostriatal path | 34.3 | 8.9 | 53.4 | 9.0 | 53.6 | 8.8 | 51.2 | 8.9 |
| Corticopontine tract | 49.6 | 8.7 | 50.3 | 7.7 | 50.7 | 8.1 | 50.3 | 8.1 |
| Corticorubral tract | 39.5 | 9.3 | 58.6 | 9.9 | 58.0 | 9.0 | 58.7 | 9.4 |
| Perforant path | 54.9 | 8.9 | 50.9 | 8.3 | 50.7 | 8.2 | 51.0 | 8.1 |
| Temporal lobe to hypothalamus | 50.7 | 8.5 | 50.7 | 8.8 | 50.6 | 8.7 | 50.7 | 8.8 |
| AIC | – | – | 50.7 | 8.4 | 51.3 | 8.3 | 50.3 | 8.7 |
| PIC | 46.8 | 9.4 | 69.5 | 9.9 | 58.1 | 9.7 | 70.8 | 9.8 |
| CC I-associated tracts | 48.5 | 8.8 | 69.6 | 10.6 | 69.6 | 10.7 | 69.5 | 10.6 |
| CC II-associated tracts | 51.2 | 8.7 | 65.6 | 10.5 | 62.2 | 9.5 | 58.7 | 8.6 |
| CC III-associated tracts | 50.7 | 8.4 | 58.7 | 7.7 | 58.8 | 8.5 | 58.7 | 7.6 |
| CC IV-associated tracts | 55.7 | 9.3 | 60.9 | 8.5 | 69.0 | 11.5 | 60.9 | 8.4 |
| CC V-associated tracts | 69.8 | 10.3 | 69.0 | 11.6 | 68.0 | 10.4 | 69.1 | 11.3 |
If no knot position is specified, the adjusted R2 of the unsegmented regression was higher (CC, corpus callosum; CST, corticospinal tract; SLF, superior longitudinal fasciculus; ILF, inferior longitudinal fasciculus; SCP, superior cerebellar peduncle; MCP, middle cerebellar peduncle; AIC, anterior limb of internal capsule; PIC, posterior limb of internal capsule).