Table 2.

Brain Volume Comparisons Between Autism and Control Groups

	HFA (N = 18)		TDC (N = 19)		Independent samples t test (df = 35)		Age and TBV as covariates (df = 1, 33)
	Mean	SD	Mean	SD	t	p	F	p
Left STG	18.82	2.51	18.34	1.94	0.660	0.513	0.743	0.395
Left posterior STG†	14.07	2.09	13.79	1.38	0.481	0.634	0.609	0.441
Right STG	18.71	2.39	17.44	1.79	1.836	0.075	4.577	0.040*
Right posterior STG†	12.79	1.87	11.60	1.47	2.154	0.038*	5.317	0.028*
Total Brain Volume	1326	120	1300	135	0.604	0.549	NA	NA

STG = superior temporal gyrus, HFA = high-functioning autism, TDC = typically developing controls, SD = standard deviation, STG = superior temporal gyrus, TBV = total brain volume, NA = not applicable.

^*Statistically significant at p <0.05.

^†Post-hoc analysis