Table 7.

The difference between number (± SE) of small-, medium-, and large-diameter axons in five CC segments in autistic and control subjects

Axon diameter	Group	S I	S II	S III	S IV	S V
< 0.651	C	8.789 (0.711)	6.955 (0.745)	1.924 (0.259)	0.862 (0.187)	4.427 (0.568)
	A	4.701 (0.890)	5.422 (0.742)	1.153 (0.150)	0.817 (0.291)	5.881 (0.885)
	p <	0.0025	0.164 (ns)	0.0253	0.8916 (ns)	0.1860 (ns)
	Diff.	−46.5%		−40.1%
>  0.651 < 1.051	C	11.177 (0.930)	10.889 (0.530)	3.967 (0.639)	1.319 (0.144)	10.405 (0.934)
	A	4.704 (0.972)	7.083 (0.836)	1.633 (0.332)	0.757 (0.178)	5.084 (0.974)
	p <	0.0002	0.0014	0.0071	0.0294	0.0012
	Diff.	−57.9%	−35.0%	−58.8%	−42.6%	−51.2%
> 1.051	C	5.933 (0.951)	7.099 (0.735)	3.985 (0.679)	1.529 (0.231)	10.389 (1.749)
	A	1.527 (0.275)	2.993 (0.438)	0.825 (0.183)	0.465 (0.159)	2.334 (0.644)
	p <	0.0015	0.0002	0.0014	0.0049	0.0015
	Diff.	−74.2%	−57.8%	−79.3%	−69.6%	−77.6%

SE standard error, CC corpus callosum, S segment, C control, A autism; Differ., difference. Standard errors in parentheses