Table 2.

The difference in average axon diameter, midsagittal area, and myelin thickness in five CC segments in autistic (A) and control (C) subjects

Parameter	Group	CC Segment
		S I	S II	S III	S IV	S V
Axon diameter (μm) (SE)	C	0.869 (0.025)	0.945 (0.026)	1.108 (0.036)	1.120 (0.058)	1.075 (0.043)
	A	0.772 (0.016)	0.836 (0.020)	0.837 (0.059)	0.858 (0.061)	0.768 (0.046)
	p <	0.005**	0.004**	0.001***	0.010**	0.0002***
	Difference	−11.2%	−11.5%	−24.4%	−23.4%	−28.6%
Axon area (μm2) (SE)	C	0.613 (0.042)	0.739 (0.039)	1.075 (0.068)	1.157 (0.117)	0.968 (0.086)
	A	0.462 (0.024)	0.543 (0.032)	0.594 (0.071)	0.620 (0.081)	0.469 (0.056)
	p <	0.006**	0.001***	0.0002***	0.005**	0.0002***
	Difference	−24.6%	−26.5%	−44.8%	−46.9%	−51.6%
Myelin thickness (μm) (SE)	C	0.149 (0.006)	0.153 (0.006)	0.162 (0.005)	0.163 (0.008)	0.157 (0.004)
	A	0.139 (0.003)	0.149 (0.003)	0.142 (0.011)	0.145 (0.007)	0.132 (0.008)
	p <	0.197	0.538	0.092	0.141	0.018*
	Difference	ns	ns	ns	ns	−15.8%

CC Corpus callosum, SE standard error, ns not significant

*p ≤ 0.05; **p ≤ 0.01; ***p ≤ 0.001