Table 2.

Comparisons of the mean GFA values of the WM tracts

						Post hoc analysisa
	ASD (n = 23)	ADHD (n = 32)	Control (n = 29)	Three group comparison		ASD versus ADHD	ASD versus Control	ADHD versus Control
Fiber tract	GFA value	GFA value	GFA value	Uncorrected P‐valueb	q‐valuec	P‐value	P‐value	P‐value	Directions
	Mean ± SD	Mean ± SD	Mean ± SD
Whole‐brain	0.289 ± 0.006	0.291 ± 0.004	0.289 ± 0.005	0.233		0.231	0.856	0.469	—
Rt arcuate fasciculus	0.267 ± 0.012	0.278 ± 0.014	0.280 ± 0.01	0.001	0.017	0.006	0.001	0.788	ASD<ADHD,Control
Rt cingulum (hippocampus)	0.229 ± 0.022	0.249 ± 0.018	0.242 ± 0.02	0.002	0.019	0.002	0.057	0.499	ASD<ADHD
Anterior commissure	0.154 ± 0.014	0.168 ± 0.015	0.160 ± 0.015	0.002	0.020	0.003	0.327	0.099	ASD<ADHD
CC (VLPFC part)	0.274 ± 0.023	0.297 ± 0.015	0.291 ± 0.018	<0.001	0.003	<0.001	0.005	0.547	ASD<ADHD,Control
CC (precentral part)	0.326 ± 0.023	0.342 ± 0.008	0.337 ± 0.014	0.001	0.015	0.001	0.026	0.539	ASD<ADHD,Control
CC (superior temporal part)	0.321 ± 0.012	0.332 ± 0.009	0.331 ± 0.013	0.001	0.017	0.001	0.009	0.842	ASD<ADHD,Control

^aPairwise comparison by post hoc analysis with Scheffé Test.

^bStatistical comparison among three groups were tested by ANOVA.

^cAdjusted P‐value with false discovery rate correction for multiple comparisons.

Abbreviations: Rt, right; CC, corpus callosum; VLPFC, ventrolateral prefrontal cortex.