Table 1.
Percentage of vertices with significant exponential (Pexp) and linear (Plin) fits and correlation (Rexp and Rlin), exponential time constant (t), absolute change of FA per year from age 6 to 30 (linear) and age (T) where FA reaches 90% of the plateau maximum (exponential) over those vertices with exponential fits for each tract (left + right combined) of males (M) and females (F) separately.
| Tracts | Fractional Anisotropy versus Age |
|||||
|---|---|---|---|---|---|---|
| Sex | Pexp (Plin) % | Rexp (Rlin) | texp (SE) | Absolute increase per year Exp (Lin) | Texp(SE) year | |
| CST | M | 22 (10) | 0.59 (0.59) | 5.5 (1.4) | 0.005 (0.004) | 18.8 (3.3)∗ |
| F | 27 (4) | 0.53 (0.31) | 2.8 (0.6) | 0.01 (0.003) | 12.4 (1.4)∗ | |
| CG | M | 28 (19) | 0.56 (0.62) | 5.3 (1.5) | 0.008 (0.004) | 18.3 (3.3) |
| F | 50 (10) | 0.63 (0.52) | 4.3 (0.9) | 0.01 (0.004) | 15.9 (2.1) | |
| CC | M | 19 (16) | 0.61 (0.65) | 5.3 (1.3) | 0.006 (0.003) | 18.2 (3.1) |
| F | 24 (8) | 0.6 (0.48) | 4.4 (1.0) | 0.007 (0.003) | 16.2 (2.2) | |
| IFO | M | 23 (16) | 0.52 (0.6) | 6.2 (2.0) | 0.005 (0.003) | 20.3 (4.7) |
| F | 34 (10) | 0.57 (0.42) | 4.1 (0.9) | 0.008 (0.003) | 15.4 (2.1) | |
| SLF | M | 18 (22) | 0.54 (0.63) | 6.8 (2.3) | 0.005 (0.003) | 21.6 (5.2)∗ |
| F | 38 (10) | 0.54 (0.47) | 3.6 (0.8) | 0.009 (0.003) | 14.2 (1.8)∗ | |
| ILF | M | 15 (15) | 0.5 (0.56) | 6.4 (2.3) | 0.004 (0.003) | 20.8 (5.2) |
| F | 21 (13) | 0.45 (0.52) | 5.8 (2.0) | 0.004 (0.003) | 19.3 (4.5) | |
| UNC | M | 20 (35) | 0.5 (0.59) | 7.6 (2.9) | 0.003 (0.003) | 23.4 (6.6) |
| F | 38 (9) | 0.51 (0.29) | 5.0 (1.4) | 0.006 (0.003) | 17.4 (3.2) | |
CST, Corticospinal tract; CC, corpus callosum; CG, cingulum; IFO, inferior fronto-occipital fasciculus; SLF, superior longitudinal fasciculus; UNC, uncinate fasciculus; ILF, inferior longitudinal fasciculus. Tracts are listed in the order of increasing mean T averaged over both sexes for FA exponential fits. SE, standard error. ∗Significant sex differences.