Table 2.
Percentage of vertices with significant exponential (Pexp) and linear (Plin) fits and correlation (Rexp and Rlin), exponential time constant (t), absolute change of MD per year from age 6 to 30 (linear) and age (T) where MD reaches 90% of the plateau minimum (exponential) over those vertices with exponential fits for each tract (left + right combined) of males (M) and females (F) separately.
| Tracts | Mean Diffusivity versus Age |
|||||
|---|---|---|---|---|---|---|
| Sex | Pexp (Plin) % | Rexp (Rlin) | texp (SE) | Absolute decrease per year Exp (Lin) 10-3mm2/s | Texp(SE) year | |
| ILF | M | 61 (19) | 0.52 (0.47) | 5.9 (1.9) | 0.006 (0.004) | 19.6 (4.3)∗ |
| F | 72 (3) | 0.39 (0.27) | 2.7 (0.7) | 0.014 (0.004) | 12.2 (1.6)∗ | |
| IFO | M | 53 (21) | 0.57 (0.57) | 7.1 (2.4) | 0.005 (0.004) | 22.4 (5.5)∗ |
| F | 64 (4) | 0.48 (0.26) | 3.2 (0.8) | 0.012 (0.004) | 13.3 (1.8)∗ | |
| CC | M | 35 (18) | 0.55 (0.63) | 6.0 (1.9) | 0.007 (0.005) | 19.8 (4.4) |
| F | 36 (5) | 0.44 (0.37) | 4.4 (1.3) | 0.008 (0.004) | 16.0 (3.1) | |
| SLF | M | 44 (41) | 0.51 (0.48) | 7.6 (3.0) | 0.004 (0.004) | 23.5 (6.8)∗ |
| F | 84 (2) | 0.38 (0.20) | 3.3 (1.0) | 0.009 (0.003) | 13.7 (2.4)∗ | |
| UNC | M | 60 (23) | 0.58 (0.56) | 6.9 (2.2) | 0.005 (0.005) | 22.1 (5.0) |
| F | 61 (15) | 0.42 (0.28) | 4.3 (1.3) | 0.008 (0.005) | 15.8 (3.0) | |
| CG | M | 18 (19) | 0.52 (0.48) | 6.7 (2.5) | 0.006 (0.006) | 21.4 (5.6) |
| F | 25 (1) | 0.45 (0.33) | 4.7 (1.5) | 0.008 (0.004) | 16.7 (3.4) | |
| CST | M | 42 (22) | 0.67 (0.62) | 10.3 (3.6) | 0.004 (0.004) | 29.6 (8.3)∗ |
| F | 55 (2) | 0.43 (0.31) | 4.2 (1.3) | 0.007 (0.003) | 15.7 (2.9)∗ | |
Tracts are listed in the order of increasing mean T averaged over both sexes for MD exponential fits. ∗Significant sex differences.