Table 2.

Comparison of individuals with ASD, their unaffected siblings and TD participants

	Statisticsa
	df	f-value	P-value	Post-hoc
Age (years)	2, 57	0.37	0.693
Full IQ	2, 57	1.61	0.209
Verbal IQ	2, 57	1.92	0.157
Performance IQ	2, 57	0.38	0.688
Handedness	2, 57	2.73	0.073
AQ
Total	2, 55	41.55	<0.001	ASD>sib=TD
AS	2, 55	22.30	<0.001	ASD>sib=TD
ATD	2, 55	5.42	0.007	ASD>sib=TD
COM	2, 55	20.93	<0.001	ASD>sib=TD
IMG	2, 55	12.17	<0.001	ASD>sib=TD
SS	2, 55	20.96	<0.001	ASD>sib>TD
SESb	2, 56	0.31	0.732
Mean head motion	2, 57	0.08	0.920
Max head motion	2, 57	0.93	0.399

^aResults of a comparison of three groups, individuals with ASD, their unaffected siblings, and all TD participants.

^bA higher score indicates a lower socioeconomic status.

Abbreviations: AQ, autism-spectrum quotient; AS, attention switching/tolerance of change; ASD, autism spectrum disorder; ATD, attention to detail; COM, communication skills; IMG, imagination; IQ, intelligence quotient; SD, standard deviation; SES, socioeconomic status; SS, social skills; TD, typical development.