. Author manuscript; available in PMC: 2011 May 1.

Published in final edited form as: Brain Struct Funct. 2010 Feb 4;214(4):361–373. doi: 10.1007/s00429-009-0238-0

Table 1.

Summary of the fractional anisotropy versus age in years least-squares fitted results on the 24 fiber tracts along with the standard errors and significant p values

Fiber tracts fractional anisotropy		y = β₀ + β₁ × age + β₂ × age²
		β₀ ± SD	β₁ ± SD	β₂ ± SD
Association pathways
ATP	R	410.74 ± 9.35^*	1.62 ± 0.63^†	−0.030 ± 0.009^†
93 (24C, 69A)	L	408.86 ± 10.93^*	1.45 ± 0.73^‡	−0.030 ± 0.011^†
AFP	R	435.46 ± 7.68^*	1.99 ± 0.51^*	−0.034 ± 0.007^*
98 (25C, 73A)	L	413.098 ± 9.214^*	2.22 ± 0.61^*	−0.036 ± 0.009^*
AFT	R	451.76 ± 10.42^*	1.68 ± 0.67^†	−0.029 ± 0.009^†
69 (16C, 53A)	L	443.41 ± 10.39^*	2.39 ± 0.67^†	−0.037 ± 0.009^*
IFOF	R	480.79 ± 9.25^*	1.35 ± 0.62^†	−0.025 ± 0.009^†
104 (28C, 76A)	L	485.20 ± 10.39^*	1.50 ± 0.61^†	−0.029 ± 0.009^*
ILF	R	459.21 ± 8.25^*	2.54 ± 0.56^*	−0.040 ± 0.008^*
103 (29C, 74A)	L	480.58 ± 7.75^*	0.93 ± 0.53^‡	−0.020 ± 0.008^†
UF	R	408.87 ± 9.52^*	1.75 ± 0.65^†	−0.028 ± 0.009^†
100 (29C, 71A)	L	414.76 ± 8.66^*	1.75 ± 0.60^†	−0.026 ± 0.009^†
Projection pathways
CST	R	569.22 ± 10.81^*	0.92 ± 0.76^‡	−0.020 ± 0.011^‡
93 (27C, 66A)	L	593.35 ± 10.07^*	0.41 ± 0.71^‡	−0.011 ± 0.011^‡
Sensory	R	460.72 ± 10.54^*	1.11 ± 0.71^‡	−0.012 ± 0.010^‡
92 (25C, 67A)	L	457.93 ± 10.58^*	1.74 ± 0.71^†	−0.022 ± 0.010^†
Commissural (corpus callosum) pathways
CC1 (prefrontal)		562.56 ± 8.90^*	0.613 ± 0.623^‡	−0.028 ± 0.009^†
CC2 (anterior frontal)		521.89 ± 8.56^*	0.62 ± 0.60^‡	−0.020 ± 0.009^†
CC3 (superior frontal)		534.54 ± 8.47^*	1.68 ± 0.59^†	−0.024 ± 0.009^†
CC4 (posterior frontal)		527.15 ± 10.69^*	2.85 ± 0.75^*	−0.039 ± 0.011^*
CC5 (anterior parietal)		529.78 ± 10.43^*	1.30 ± 0.73^‡	−0.021 ± 0.011^*
CC6 (posterior parietal)		570.02 ± 10.31^*	0.05 ± 0.72^‡	−0.014 ± 0.011^‡
CC7 (temporal)		569.94 ± 10.47^*	−0.02 ± 0.01^‡	−0.017 ± 0.011^‡
CC8 (occipital)		637.08 ± 8.51^*	0.61 ± 0.60^‡	−0.015 ± 0.009^‡

Age at peak (in years) and standard deviation (SD) were computed assuming significant fit model (linear and quadratic) coefficients as detailed in the “Methods”

NA not available as any of the linear or quadratic terms was not significant

p < 0.0001

^†

p < 0.05

^‡

p = 0.08