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. 2021 Oct 20;13:753236. doi: 10.3389/fnagi.2021.753236

TABLE 2.

Fitting parameters for quadratic fit equations of each DTI parameter.

FA Intercept Linear term (×10–2) Quadratic term (×10–4) R 2 R2 adjust P value
VIS 0.737 0.138 −0.143 0.008 0.006 0.000
SM 0.585 0.160 −0.229 0.059 0.057 0.000
DA 0.644 0.294 −0.337 0.083 0.082 0.000
VA 0.550 0.291 −0.326 0.070 0.068 0.000
LN 0.468 0.151 −0.210 0.016 0.014 0.000
FPN 0.541 0.312 −0.344 0.088 0.086 0.000
DMN 0.581 0.244 −0.283 0.093 0.091 0.000
MD Intercept (×10–3) Linear term (×10–5) Quadratic term (×10–7) R 2 R2 adjust P value
VIS 0.962 −0.474 0.531 0.047 0.046 0.000
SM 1.205 −1.060 1.243 0.170 0.168 0.000
DA 1.062 −0.873 0.979 0.196 0.194 0.000
VA 1.188 −0.980 1.162 0.212 0.210 0.000
LN 1.250 −1.145 1.318 0.117 0.115 0.000
FPN 1.196 −0.941 1.089 0.203 0.201 0.000
DMN 1.156 −0.894 1.017 0.209 0.207 0.000
RD Intercept (×10–3) Linear term (×10–5) Quadratic term (×10–7) R 2 R2 adjust P value
VIS 0.480 −0.383 0.429 0.027 0.025 0.000
SM 0.787 −0.866 1.051 0.141 0.140 0.000
DA 0.629 −0.800 0.911 0.163 0.161 0.000
VA 0.794 −0.891 1.044 0.177 0.175 0.000
LN 0.921 −0.962 1.133 0.085 0.084 0.000
FPN 0.810 −0.883 1.014 0.179 0.178 0.000
DMN 0.754 −0.794 0.917 0.194 0.193 0.000
AD Intercept (×10–3) Linear term (×10–5) Quadratic term (×10–7) R 2 R2 adjust P value
VIS 1.926 −0.655 0.734 0.042 0.040 0.000
SM 2.041 −1.447 1.627 0.164 0.162 0.000
DA 1.927 −1.018 1.115 0.142 0.141 0.000
VA 1.977 −1.157 1.397 0.198 0.196 0.000
LN 1.908 −1.510 1.690 0.097 0.095 0.000
FPN 1.967 −1.058 1.241 0.181 0.179 0.000
DMN 1.961 −1.093 1.217 0.165 0.164 0.000

Parameters for the quadratic equation are shown, including intercept, linear and quadratic terms for all seven regions of the corpus callosum, as well as the R2 and R2 adjust value and p value for the entire fit.

The unit of MD, AD, and RD is mm2/s.

VIS, CC subregion connecting to the visual network; SM, CC subregion connecting to the somatomotor network; DA, CC subregion connecting to the dorsal attention network; VA, CC subregion connecting to the ventral attention network; LN, CC subregion connecting to the limbic network; FPN, CC subregion connecting to the frontoparietal network; DMN, CC subregion connecting to the default mode network; FA, fractional anisotropy; MD, mean diffusivity; RD, radial diffusivity; AD, axial diffusivity.