Table 6.

Linear regression: QSM values from superior frontal, precentral and superior parietal GM ROIs and Trails-A performance.

QSM Reference Structure: Default MEDI Toolbox
Left hemisphere
Effect	¹ β	r²	p-value	SE	95% CI		VIF
L Superior frontal	−0.292	0.052	0.207	1.781	−5.932	1.341	2.232
L Precentral	0.504	0.120	0.052	0.820	−0.019	3.329	2.707
L Superior parietal	−0.381	0.091	0.093	1.127	−4.255	0.348	2.105
Age	0.371	0.143	0.033^*	0.278	0.055	1.190	1.197
Gender	0.042	0.002	0.804	2.949	−5.286	6.789	1.230
Right hemisphere
Effect	¹ β	r²	p-value	SE	95% CI		VIF
R Superior frontal	−0.077	0.003	0.759	1.791	−4.213	3.102	2.573
R Precentral	0.206	0.026	0.377	0.948	−1.085	2.786	2.171
R Superior parietal	−0.359	0.070	0.142	1.398	−4.965	0.748	2.334
Age	0.392	0.151	0.028^*	0.284	0.076	1.238	1.189
Gender	−0.123	0.018	0.468	2.948	−8.187	3.854	1.164
QSM Reference Structure: Lateral Ventricles
Left hemisphere
Effect	¹ β	r²	p-value	SE	95% CI		VIF
L Superior frontal	−0.294	0.045	0.242	2.797	−9.046	2.376	2.577
L Precentral	0.459	0.125	0.047^*	1.378	0.045	5.673	2.078
L Superior parietal	−0.212	0.030	0.342	1.752	−5.270	1.887	2.039
Age	0.341	0.113	0.060	0.292	−0.025	1.166	1.284
Gender	0.029	0.0004	0.866	2.973	−5.565	6.576	1.217
Right hemisphere
Effect	¹ β	r²	p-value	SE	95% CI		VIF
R Superior frontal	−0.026	0.0003	0.924	2.835	−6.061	5.519	2.915
R Precentral	0.161	0.015	0.502	1.733	−2.362	4.717	2.136
R Superior parietal	−0.249	0.034	0.315	1.957	−5.995	1.998	2.268
Age	0.386	0.141	0.034^*	0.291	0.052	1.240	1.150
Gender	−0.137	0.02	0.435	3.043	−8.626	3.805	1.148

Standardized coefficients.

p < 0.05.